Well the Constellation-A "cruiser variant" refit takes 1.5 years, not 1 year.
Renaissance takes 3 years or 2.25 years for Starfleet in parallel builds. 3 Constellation-As are comparable to 2 Renaissance in capabilities and costs, and with the parallel build bonus, the same berth time (3*1.5=2*2.25), albeit lower latency for the Constellation-A refit.
You know, if we could directly trade resources with the Andorians, we should be able to do the same with Rigellians in an coming MWCO. Not sure what we could trade for, and "trading" for a priority change sounds like a bribe.
I'd love it if we could do a Civilization-esque long-term trade of 50br/yr and 30sr/yr for increased Starfleet Academy recruitment (0.5 O/E/T?). Basically trade them the equivalent of a Starfleet budget increase for an Academy expansion.