I think I will wait for conquest before converting them, first to know what new units are available, second to see what are the new flags, and how I could use units (the SAM for instance).
I will start by units that I could use as generic units : machine gunner, marines, cavalry...
It should not be to long to convert one unit once my new version of SBB is ready. I would say about 30 minutes for one units (there are not that much animations, basically move, attack, death).
But of course I need to make this version first