Maxim has replaced infantry since its inception because at no point in the game have cons really beeen in a position that it was worth getting them and/over a maxim when you just paid 160mp to unlock the maxim
But of an overhaul here but hear me out:
Cons become passively cheaper once a building is built but t1 and 2 become a 20mp more expensive
T1 makes cons a bit cheaper to reinforce to promote using them to supplement penals. Penals are in exchange made slightly more expensive per man
T2 gives cons a cover bonus that gives a bonus against suppressed units so that they might be used in conjunction with the maxim as dps. Maxim can be adjusted to be less independent
In my experience now the maxim is not independent. It needs more baby sitting then most mg,s. The cause is its lacking supression, direct and aoe. It allows frontal deathlooping way to often.
I like the suggestion of cons have an aura for maxims. That increase it supression but that leaves the fact that you pay 260mp 240mp 160mp and 15fu just to have it supress reliably. It wound,t be cost effective what so ever.
Right now i avoid the maxim when ever i can. It gets deathlooped a lot and feels like it tickels the target. Its mediocre at best for a premium price.
I mostly go for duska doctrines. I get 1 usualy and 2 max. And they do the job but the cost is in line with its performance.
Again the maxims mobilty was gutted. Just let it supress it cant come close to it golden days.