Quoted from bdPinball:My house is already on stilts, and if I had my way all my games would already be upstairs in my living room, spare room, bathroom, etc..
Could you spend money on a system of block and tackle for each game. That would allow to raise the pins to the ceiling of the pin room. Securing that weight to the ceiling above would have to be worked out.
Then create a way to get all of the flood water out of that room as fast as possible. You should be prepared, generator, electric fan/blowers, floor squeegee, and sump pump with battery back up. Which ever works for your room.