Unfortunately, this is DP2. If these maps weren't instantly seen as Pbcup level quality, I highly doubt you will increase participation. So at best, all your work will give you the same outcome - and possibly less if people don't like the map. So, the question to you becomes: Is that effort worth the same participation - and potentially less?
NA's are stubborn, they wont join if they don't like the maps. So, you certainly wont increase through NA participation, other than the ones who have previously participated, that is.
And as far as I know, most of the EU teams already participate. So, as long as they like the maps participation wont be changed there.
I don't think it's worth the effort when the max you can get is 2v2. In reality, most 2v2 games don't really require much communication between teams, you rarely set up grabs etc... If it gets to the point where you're able to constantly run 3v3 tournaments then I would say it'd be worth giving it a shot with this idea.
So, IMO, you should work on maps that can be viable in 3v3 play, but don't release them yet. Try to get 3-5 maps done, then if your tournaments pick up and expand, release them and try the idea. If they don't, then just release them as maps, and try to incorporate them into tournaments.
As for the name - I wouldn't do a team name. spec_whatevermap isn't good. eR33t didn't do eR33t_map - they did Pbcup. Try to find some alternative. Eventually, if the game is still "active" after you quit, having your tag in the name will seem weird.
