Accidentally used thermal PLASTER instead of thermal paste. Have I fucked myself?

The title says it all, really.

I'm in the process of adjusting my current build, which has required taking my components like my cooler and my CPU out several times to test things.

I went to a nearby electronics shop to pick up a new tube of thermal paste, however they ended up selling me what I now understand is thermal plaster or heat sink plaster, which is apparently intended to be used to PERMANENTLY adhere a heatsink. Mind you, I asked for paste but I guess it's at least partially my fault for not double checking but fuck me I didn't even know thermal plaster was a thing.

I deeply do not wish my cooler to be permanently attached to my cpu, especially since it's currently in a motherboard I'm trying to replace, and the CPU release lever is blocked by the fucking cooler.

What can I do about this? As far as I can tell this is not something that happens often so I'm at a bit of a loss as to what to do. I've tried the ol hair dryer and tooth floss trick extensively and while I think it might be doing something, it's incredibly slow going and I'm worried I'm going to damage something.

UPDATE: I have successfully removed the CPU from the cooler! A much stronger solvent (100% iso alcohol) combined with a very sharp straight razor blade was enough to SLOWLY (it took several hours) hack through the plaster enough to break the bond. Cleaning up the residue isn't looking to be much harder.

Thank you for your help and your jokes, I really did think I was doomed for a while there. Shout out to the guy who recommended a chainsaw, I was fucking tempted at points.

Please don't make the same mistake I did if you can help it.