I've used mkick for YEARS without problems. If I've ever had a compatibility problem, I've never realized it.
http://ftp://atrey.karlin.mff.cuni.cz/pub/local/mj/amiga/aminet/MKick19.lhaI think this is the file.
I wrote a small startup script that detects when it is running under the older rev and automatically loads the file into RAM, relocates the pointer, and then reboots. On an HD A500, the whole process takes probably 10 seconds or so.
On subsequently warm restarts, it survives. On cold starts, mkick must, uhh, kick again.

kamiga