TBH I think this is a very bad idea.Gently pull on the heat sink during the process to help things along.
I want to see a video of his attemptWell, the operative word was "gently". But you are right, using the heat sink to assist in removal is inappropriate. And hopefully his processor board is OK and just needs to have the tray body replaced, so we do not want to add more challenges.
Percator, have you made any progress with the problem?