Any way to do it without permanently welding or cutting?
As far as I know there shouldn’t be any problem with that happening. The cases I’ve worked on, if they can mount a JLF, they can mount a LS-32.
I don’t know about other models, but I know LS-32’s work fine.
No, it will not work.
JLF is barely shallow enough for VSHG, and that’s without the mounting plate.
All Seimitsu sticks are too high to fit in VSHG.
It’s why I sold mine.