nah, no problem..just balance the unit costs( in export_descr_unit, you there have 3 costs: capmaign recruit, campaign upkeep, custom battle cost) so the faction that has 'weaker' units, and was historically 'a bump in the road' would have lowered costs.

but again, i should nota that there's no real weak faction..it all comes down to the terrain, and the player..

so, except the 'weird maerketing strat' what do you fear that is going to happen?