Malleus: Activation is not restricted. You can't buy this version in those countries, but you can activate in them. I have a western base game myself (languages are EFIGS) and it could be activated no problem even though I live in the eastern region (RHCP/Cenega) and therefore cannot buy the DLCs for it, because Steam only offers RHCP region DLCs and my base game is EFIGS.
http://forums.steampowered.com/forums/showpost.php?p=31834539&postcount=4 Though if you're not convinced then I shall not enter, no problem. :)
I don't really understand the whole system to be honest, I'll just send the key to whomever wins. I added the information because someone warned me that Steamgifts frowns upon it or something?
Like I said, I don't really get it.
As for having the base game already (or even the entire game), I don't really care. If you're OK with it, I'm OK with it.
Personally I for example don't enter for GOTY editions if I'm missing one DLC, because I'd rather have someone else enjoy the game in that case. But if there is a lot of DLC I don't yet have and I really intend to play it, I'd still enter.
It's a subjective thing I think.