I think that if you want to port dp to something, then the best and the easiest way would be to become warsow's mod.
I'm not kidding here. You can already play all dp maps in warsow. Sure, the skybox doesn't work and water isn't reflective and some more bugs probably, but I guess these are problems which could be fixed.
You can probably do pretty much anything in warsow - (gameplay modification, new gametypes), so removing all the warsow guns, adding paintball guns, removing dash and walljump would all be doable. Plus you can modify the jump heights and walkspeeds so it would be just like dp! Except on a different engine... On an engine that enables for a game that looks like 21st century to run smoothly... even on average computers.
If anyone is interested in doing something like that (think that scripting would take less time than fixing the maps) then head on to warsow.net forums and start looking up on gametype scripting/angelscripting etc.