OK, some interesting findings :-). And back to thinking it may be QEMU related? 
Let me explain, by all means disagree!
1) I found that using OpenCore with macOS, I no longer need a custom UEFI. So, 
I tried the UEFI that comes with Ubuntu (apt install ovmf, copied the files 
over). No change. So then, I cloned and built the latest UEFI from Tianocore / 
EDK II (https://github.com/tianocore/edk2). Copied that over (and VARS, 
default), no delta. And as I can't get into the UEFI menu on VM startup (i.e. 
press ESC, F2, etc.) ... seems to be OS independent, just an issue between UEFI 
and QEMU - agreed?
2) Figured I'd try to clone, build and run the latest version of QEMU, see if 
that is it - FYI, the current version in Ubuntu that I'm running is,
QEMU emulator version 5.0.0 (Debian 1:5.0-5ubuntu9.2)
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers

OK, that said ... I can build, install => but can't get apparmor to let
me run my custom QEMU executable (arrgh!). I even tried disabling
security_driver (set to "none" in /etc/libvirt/qemu.conf, restarted
libvirtd.service) ... but no joy. Can't get the latest QEMU to run. Any
thoughts here would be appreciated! This is to see if it's an "older"
issue, and may be resolved already.

3) An interesting side note, when I did get into the UEFI menu (post VM
reset), changed the resolution ... I could no longer boot (fully) my
guest OS. Had to reboot my host OS (Ubuntu), then all OK. Very odd, but
an observation :-).

Thanks for all the help!

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https://bugs.launchpad.net/bugs/1906155

Title:
  USB Passthrough Fails on Start, Needs domain Reset

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