Okay, I tested it with a hotseat game. Goblyn, if you rehost using the 2h and trn files from turn 15, it WILL work despite the fact it shows us as not having any moves. What happens is, turn 15 will work fine, all of us except you will stale turn 16, and turn 17 will be back to normal.
In other words, if you yourself don't do any moves on turn 16, we should all be fine. The only problem is, we won't be able to rehire mercenaries or give orders on turn 16 (I see a bunch of them will have to be rehired on turn 16), but I think that's a small price to pay.
EDIT - We'll probably also miss the turn 16 battle reports, if any. Still, at least the battles will work. Might be a good idea to back up the whole folder for this turn.