Well they would still appear later, not have access to rack weapons and so on...
Imo doctrinal infantry upgrades could also come with tech cost giving the player the choice weather to invest in infantry upgrades to get better infantry options or to follow normal tech up.
The current CP limitations don't really work since one can spam infantry and just wait to reach the CP requirements that will allows his numerous infantry to become superior.
still... im not sold at this time about ost rifles being good for balance... quick team weapons is a decisive difference between ost and usf. rifles are meant to bridge that and having access to both might be too much.
i could get behind treating doctrinal units as extra-core instead of a bonus of sorts, it would add another layer and admittedly, it seems to be the trend we are seeing, so it might be best to go all in instead of half assing it. some units should simply be T0 others both call in and t0 (infiltration units) with a slight discount, imo. call ins are too reactive and less premeditated, less tactical and less punishing.