I'd use CM:SF2 (with all the modules).
You can't actually copy a tank from CM:RT to CM:SF2.....You may be able to copy the models & skins and use them to replace something else, but whatever you used would change in appearance only. So if you managed to transfer the models & skins for a T-34/85 onto an Abrams, it would still behave like an Abrams in the game.
A lot of the AFVs are already available.....T-72M1 is dead ringer for M-84, T-55 is a T-55 and so on. Better to tailor your scenarios to what you can actually make, than trying to bend the game into something it just is not. This is something we ran into with 'Heaven & Earth', we've had to make a few compromises, but with some creativity and clever use of mods (often with custom tags) on @37mm's part, we've managed to get by quite well IMHO.