Daily builds of ubuntu 20.04 are now showing up, I'll give them a try and talk about it.
Beta testing in a time of coronavirus...
Picked up the first daily build. Browse to http://www.cdimage.ubuntu.com/daily-live/current/focal-desktop-amd64.iso, run Startup Disk Builder, write to USB. Pretty easy! I'll definitely want to mount some of my regular disks after booting the USB, will have to see where to put that script. Startup Disk Builder is painfully slow, though. Can't I make some internal hard drive dualboot?