There are only a few upgrades that make real differences in terms of ability to show your skill, kind of off topic here but these are the upgrades which really do give higher ranks a better chance imo.
Air Transport capacity I and II
Faster Infantry
Marines
Transport Capacity
if a player is non premium (general is a gamebreaker) if you have skill you should be able to compete effectively with these upgrades vs any rank.
Anyway I don't see a problem with your idea, support.