Maybe I do not understand the comsat strategy or the way upkeep works, please correct me.
In my understanding comsats in the queue do not count for upkeep, so in many cases you can leave them 1-turn unfinished. Ok for huge numbers you need to make sure your supply lines are good so you can finish them any time. How many comsats were there in the game?
I think upkeep should also consider items in the queue. Maybe as a ratio of completeness - so if 2 out of 3 parts of a comsat are finished, it adds two thirds of what a comsat usually adds to upkeep).
Another thing - somebody was talking about part upkeep. There is hull upkeep and part upkeep. Classic comsat does not have parts, so only influence hull upkeep.
Also if we get real upkeep (having to pay influence every turn for existing ships) keeping comsats around might hurt more. E.g. not being able to spend PP on ships as your influence is below zero.
For ship weapon targetting i would suggest to ignore ships without (non-fuel) parts. That makes the comsat more expensive (probably adding a troop pod, doubling the cost) and also increase the part upkeep and make those more reasonable as troop ships are useful.
We could also up the base hull cost a bit -maybe to four- but not much as the small asteroid only costs 6 PP.
One could still trigger combat with monsters with an empty aggressive comsat.