Hmm, very impressive, as @Garyg said, it’s a very neat parcel of plastic you have there!
I’d perhaps be cautious about heating it excessively; it’s hard to tell but it looks like the nozzle is buried under at least 1cm of plastic in places and heating too fiercely might just melt locally around the nozzle and potentially cause a hazard. I might try heating to only 100 - 120C or so and leave it a good long time so that the heat spreads through more of the mass, you may then be able to pull it off in one go. Whichever way you do it, don’t leave it unattended while heating.
If heating doesn’t work, I guess it’s disassembly and a bath of acetone…
