How about your local TV station? Media always look for a good "human interest" story! In your local paper too, if there is time.

You don't give away the actual location of the kittens, because sickos read papers and watch TV too - but the station will take calls of professional volunteers!

I bet that would get you the help you need. All I can think of!

OR - if a friend or relative of a friend works in the FD, roof repair, etc...or call the FD and say you just need one cat-lover from the department.

Wish I had more ideas! I'll keep watching...

Catty1