So this took a few more hours but looks to be considerably better (faster, more stable, and more portable) than running from the USB live image.
This took two USB keys - one 16-32GB (Linux Mint) and one 64GB (uncompressed HamPC image)
1) I used Rufus (Etcher probably works as well) to create a Linux Mint bootable USB key and then booted from that (ESC until given the BIOS menu to select boot device).
2) From there I inserted the second USB key into the other USB port (one on each side) and then opened the Disks tool (LM menu -> Accessories -> Disks) and selected the 64GB drive that is installed ("Biwin SD Card" in mine).
3) At the top right of that window is three dots on top of each other - I clicked on that and clicked "Restore Image"
4) I navigated to the .img file and selected it and clicked on "Start Restoring..."
5) Made a cup of coffee and enjoyed a few of the old (good) Looney Tunes reruns, then rebooted when it said it was done.
6) I had to boot into the BIOS one more time to change the boot order so that "ubuntu" was the first choice.
WiFi worked right out of the gate, along with the Broadband card (if it has an active SIM in it). Audio isn't working yet so I am looking into that - could just be trying to output to the wrong port).
Will update the list if I come across the cause and fix for that.
WD0FPE
