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A heat gun applied directly to the joint will break the bond on PVC glue to PVC. Five minutes or so should do the trick. In the absence of a heat gun, I’ve used a powerful blow dryer 2000 W or so for a little longer.
If you want to actually remove the PVC from the bulkhead, this is the only way.
If you can cut it about 2" above the union you can glue another fitting on there to fit the new plumbing. This would be the easiest way to go.
If those options scare you(nothing wrong with that, piping can be intimidating at first), replace the bulkhead and trash all the piping and start from scratch.
As said spend the money on a union. This is something that you dont want to do now but will at some point be worth it. Ive been piping tanks for 20 years and this always holds true. Put unions EVERYWHERE.