Yeah I only did one as I needed to build one anyway and it certainly works but I found aspects of it tricky like trimming the cam accurately (took too much of one side so bad to even the other two) and fitting the little stop screw in the plastic of the G4 cam (not needed in the LM) Also getting a cam washer combination that was 1.6mm (or whatever it was) thick to raise the cam for a better idle. It worked out well for a first attempt. I'd recommend grinding back the cam humps rather than sawing them off.
You can always adopt whichever changes you without the other ones. I agree, if you can cut the grass well and stop the motor, leave it be as long as possible.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!