Surely Airways can foot some of the bill for the re-commissioning of Flight Service at PP, and perhaps return slightly less to the airlines each year? User pays is an acceptable policy in places, but the $50 per movement charge that I have heard thrown around is not sustainable for the users of the aerodrome. Personally I'd be happy to foot around $30 max (including landing fees, which IIRC are around $15 for a C152 at PP). The Part 121 and 125 operators can surely accept a slightly smaller refund in their airways charges to subsidise the safety of all aviation?
In fact, while re-commissioning Flight Service will have obvious safety benefits, why not do it properly and set it up as a Class D tower? (I'm sure Ardmore could use this too.) Would have even greater safety benefits, and I imagine not cost much more than FSS. Would make a great tower for trainee ATCOs to make a start too...