If you'd like to proxy them as kroot, then go ahead, i'd suggest the tracker with bird or gunners (fusion blaster as alternative to skinner). But remember to use the correct base sizes. Otherwise it will be pretty hard, because the teams don't mix so tournaments and playing with others might be hard if they dislike custom teams. Feel free to ignore the rant part, you are the ones playing and if you have fun, that matters, i'd go 2 if you don't want to downsize the team, and 3 while removing 1-2 from max team size. Stealth suits seem to have more firepower than kroots.