It sounds like a decent idea, but however you do it you will incur some overheads I feel.
Perhaps a one off subscrition charge a little like friendsreunited had at the start.
You obviously have a website which you could have banners on like PPRUNE for various companies to advertise as another way of raising the revenue you need to keep the thing running.
As to who is going to run the thing long term how about keeping it in house so to speak. Once those who started it find employment their replacements are the next in the food chain - ie you need to be an out of work fATPL or in the process of getting one, to work for the organisation. This would provide employment for a few out of work people, with the added bonus of allowing them to keep in touch with the industry.