I like this list.

Others:
Theme Hospital: https://corsixth.com/
Heroes 2: https://github.com/ihhub/fheroes2
Caesar 3 (Julius - faithful to original engine mechanics): https://github.com/bvschaik/julius
Caesar 3 (Augustus - Julius + modern features): https://github.com/Keriew/augustus

Full game included:
Seven Kingdoms (Ancient Adversaries): https://7kfans.com/

Good luck!, not that I think you'll need it. But I do think you are extremely limiting your options by not allowing the use of WINE (for Windows games), even though it does not need internet access to function (other than updates). Having DOSBox (for old DOS games) available would be a good idea if that era of games interests you.

Maybe having a thorough think through and quite a bit more research before finally commiting yourself to quite a restrictive set of rules to consume your games might be a good idea. Especially if your eventual location will severely restrict your option to change or make adjustments if things don't work out according to your plan...

If you use Wine with Lutris, you would barely need internet, once you have initial things set up.
No need to connect to the internet for installing games, or playing them.

Only in case you have a missing dependency, you would need to connect to the internet. But that would be an issue in case of native Linux games too, and native Windows games too.

There are tons of tools out there, and you flat out refused to use them. Linux's biggest selling point is the ability to modify its libraries for your personal use. Literally all of it is "3rd party" software. Linux is comprised of multitudes of user built content. WINE, Proton, Lutris are tools built specifically for Linux by the Linux community and you want to shit on them for someone not including them directly in a build?

Imo anyone calling themselves a consumer is better off with mac or modern windows to begin with.

Hahaha. I came to that conclusion years ago.

Now, I'm not saying you can't use Linux for your emails, office program, watching YT, or whatever...but when it comes to gaming - the ease of use of Windows is unbeatable.

There are too many hoops to jump through on Linux, and that starts already with your decision, which distro you want to use, and how everyone (and their aunty), will explain to you, as soon as you make your choice publicly known, why your chosen distro sucks donkey balls, and why you should rather use "obscure distro XY", instead.

An opinion, of course, which will be immediately called out as bullshit by someone, and that someone also won't tire to tell you, how much better you'll be off, by using this "experimental distro YZ", that he uses, and which is totally fine - if you don't mind having to setup your system anew every 48 hours.

And yet - all these "experts" are constantly online to ask other "experts" how to best achieve "simple thing A" and "simple thing B" under this or that distro. XD

On my GF's laptop when i installed linux and tried to get games to work for her, DosBox games and of all things Fez were the only ones that really worked, at least of the ones she wanted to try and play. Fez played remarkably, and was slower and graphically buggy on Windows. When considering WINE is more like a cousin to DosBox. WINE mostly forwards appropriate commands to the OS, and has a number of dll's and libraries that are required for it to work, and is not DRM in and of itself. WINE is also not perfect, so not everything works with it.

Read the whole post, he's talking about keeping backup not using linux.

I did - did you?

https://www.gog.com/forum/general/diving_head_first_into_native_linux_gaming_wish_me_luck/post1

Quote: "A whole lot of games on my list of 187 on GOG are not natively supported. Some games are really crushing to see gone. If we all just keep accepting windows or relying on 3rd party "fixes" and not native support, nothing will ever change. If you disagree I genuinely hope you're happy and encourage you to do as you please. Thanks for taking the time to check this out. :)"

That post.

Yes, I read that post, too:

Quote: "I gave up.
Keeping backups and organizing and ripping turned consuming media into a fucking job, I got sick of it.
Trying to move to linux exacerbated everything.
Barely even a handful of games were ever worth revisiting to me (Warband, KCD, DAO)..."

I don't think ripping on linux is more work than on any other platform (not sure why you bolded just this part of sentence) and sticking to native only was quite unrealistic plan from beginning. Out of 3 mentioned titles 2 are very much playable in wine and third is native, I don't see intentional rejecting viable tools as platforms fault.

I wonder if the OP realizes how much of his chosen Linux distro is just third party software that was included in the Linux build by the team/community working on it.

Ah, I see...one of the aforementioned "experts" on the topic.

Since you have to ask: I bolded that part of the quote because games on disc are "consuming media", too, that one can "rip".