What would happen if the stone block containing the switch at the start of the RJP became a rock jelly? Would the jelly stay inside the switch, or would it pop out?
If it stayed inside, could players still hurt it? Could it still hurt players? Would it be possible to get it out?
the block will remain a block until you hit it, then it wil destroy itself and spawn a rock jelly in its location. since two objects can't be on the same spot, the rock jelly would spawn outside of the switch, ruining your immersion.
besides, it would be too much of a clever plan for slimes.