Evil Sid,
The bump stop is held in place by a small "mushroom" shaped centre section that the rubber stop fits over and locks onto. The part around the bottom of the bump stop provides support for the stop under compression.
Now if you cut the underling support out, the stop may stay in place for a period of time. However I suspect that under loading conditions, it would simply pop off the "mushroom" as it would have a tendency to lean to the under cut side. (at least that's the way I THINK
it would react)
Just my two cents worth, but there may be better opinions out there.
Cheers,
Doug