Figured it would take time to load off the slow drive I walked away, and when I came back Memtest86 was running with all its default settings! Got up this morning and it completed 4 passes with 100% success. I choose the first and the screen went black. The USB 2.0 stick was certainly slow to set up but after it did I Option booted and saw my HD and two orange EFI drives (?). (Another pilot error I committed: I originally downloaded the older V4 version as I misread their webpage and trying to make that work wasted a bunch of time.) Success! After reading in other threads that someone had to go through 4 USB sticks before finding one that worked, I pulled out an old USB 2.0 4GB stick and went through the process described in the Memtest86 docs using the terminal. I'm then going to try and upgrade to Ventura on the theory that that will clean out some dross that's at the root of this (something old and incompatible that's sticking around.) If that works great and if not then I'll reformat the HD down to the studs, install a clean version of Ventura, and then freshly install only those apps I actually need/use, keep my old file available on the SD clone drive, cross my fingers, and maybe get a small UPS so I can power down in the next storm! I created a fresh TM backup and am also currently making an image of the entire disk using SuperDuper (which has been running for almost 5 hours straight without a panic. I also originally thought it might be a power supply related issue, but running the machine in Recovery mode for almost 48 hours (in order to run the Disk Utility on each of my drives including two TM drives) was crash free! I've tried to see if unloading various non-apple pieces that get loaded on each boot might help, but no success yet. Thanks so much for the suggestions! It is a puzzlement. I have been finding that these Memtest86 CPU settings tend to cause the memory test to freeze fairly quickly if there is a hardware issue.this is just as useful as an actual error result because it means you can remove memory modules to see if the issue is resolved. If the default settings don't reveal a problem, then change the Memtest86 CPU options to "Round Robin" and "Sequential" to see whether the tests have any problems when using either CPU option. You can also try running Memtest86 to see if any issues show up with the memory. You can try running the Apple Diagnostics to see if any hardware issues are detected. What is the make & model of the memory used for the upgrade? The first suspect would be the memory from the upgrade since Macs are very picky about the memory used. It is most likely a memory problem since the Kernel Panic log snippet in the report references "memcpy" which is "memory copy" and the size check failed. If you are using a surge power strip, then try plugging the iMac directly into the wall electrical socket instead just in case the power surge strip sustained damage from a surge. A power outage or surge could have damaged the power supply or perhaps even the Logic Board.
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