Hi,
Sorry if it's too late, but you can do a long sim (200 frames), cached it.
Chop it up into 2 sequence (just rename them), example:
from cacheA.0001 to A.0200
to cacheA.0001 to cacheA.0100 and cacheB.0001 to cacheB.0100
blend two cache files together and cross fade them somewhere in the middle. I used them all the time.
(The final shot is 100 frames but you can loop it endlessly)
Good luck