Ahhh, got it now. The essential problem is that sticky labels are hard to attach to a USB stick. 
On a more serious note, we have mentioned Ventoy here previously. I have serveral isos on a Ventoy USB stick but they are not always seen by the new computer. Such was the case when I tried some of @jdownie’s immutables.
You mentioned the Iodd-ST300 and 400 in that thread. You’re current solution covers a lot of what it provides but runs on repurposed hardware.
Such is the true spirit of a homelabber.