Unlikely as this may be, I'm going to suggest it anyway:
Kaii should contact FD, and see if they would be willing to issue each member still out there either a new account, or perhaps a second Commander on their current one (that would start from scratch, naturally).
Also ask if they would be willing to put a POI in the game at Decision Point (or whatever you call the last jump location), that could show up in the Passenger Mission list, commemorating what has transpired.
Should a way for them to return become available, they could pick those Commanders up where they left off, should they choose to do so. Those Commanders would be granted a special decal for their ships, and perhaps for the forum as well.
There are a number of problems with these (because there are those who would try to take advantage of something like this), but they are not insurmountable.
Like I said, it's unlikely, but I think an attempt should be made.
Otherwise - with over 300 Commanders, it's possible you could make the shape of the Distant Stars logo on a planet's surface, then detonate.
Riôt