Linkstyle 10PCS 6–10 AWG Wire Connector Nut Kit, 80A Heavy Duty Screw Splice Connector, Brass Quick Wiring Terminal, Screw-Fixed Type Heat ShrinkButt Wire Connector for Automotive, RV, Marine, Solar

Yes, cutting off the plug was exactly what I had in mind. I did make clear in my OP that I'm willing to void a warranty. I'm NOT willing to burn down my house, though, so I appreciate both your expertise and your candor. There must be safe (and code-compliant) ways to connect stranded and solid wire. A quick search indicates there are set-screw connectors, split bolts, lugs... a number of options. Just one example:https://www.amazon.com/Linkstyle-Wire-Connector-Nut-Ki/dp/B0CZ3W9TGC?th=1 As I said, I know just enough to be dangerous - which is why I posted here. Thanks for your help!