I'm really excited about this game, but there needs to be a native Linux version for me to buy.

Always 300% preferred to get a native version, +1.

But in case, Lutris is a really nice and easy way to get practically any Windows game to run that I've tried so far. Even playing already installed ones, right off my Windows NTFS drive, works like a charm. So if we don't get native, there's always that option.

No native, no purchase is legitimate, especially now that SteamDeck uses Linux and the incentive to provide native support is bigger than it has ever been. But I'd still temper my expectations, I guess.