Sorry to hear it didn't all go to plan.
Working on anything can be frustrating, but modern cars with breakable plastic clips and torx/Allen headed bolts even more so.
Personally, on the sump bolt I'd try a decent set of locking mole grips, cranked up as tight as you can get them to lock on the bolt.
If that fails, I'd weld something like a screwdriver to the sump plug head...
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