A thought:
The Betazoid Patrol Cruiser is a 20+ year old design, yet is a 1mt cruiser with P5. Unfortunately we voted not to refit it in a recent MWCD.
With the BDF becoming federalized, I wonder if we could get a faster and cheaper P-specialist cruiser refit than a Prennie. It surely wouldn't be as powerful, but since it's already optimized for presence, I'd imagine a P8 refit and possibly new builds could be cheaper. Plus, the BDF (or us, when they're federalized) could refit their 3 existing Patrol Cruisers for even better performance in diplo TFs.
AFAIK, it's not reverse-engineered in the ship designer, so that would need to be done first to verify.