I'm not aware of any memory defragment tools for chip ram and i can't find any on aminet, but it is clear the extended rom is using up way too much chip ram for my liking
When you start without the extended rom you have 1.92 free, maybe it would be possible to somehow disable the extended rom on a reboot and load a very small compatible cd device and boot. But that would be a long shot and there is no telling what other dependent things would be missing.
EDIT: I did load without the extended rom and ran add36k then loaded worms dc and it worked fine.
It doesn't work with add44k, I think you misread what i typed about add36k. What it does is it frees 36k and 21k, try it.