Oh damn, would not have expected that to work. The worst hack I ever used is when I helped a friend install Linux who didn't have any spare (working) USB drives around. He did have a spare SSD in his PC however, so I ended up flashing the ISO to that.
Ventoy is an open source tool to create bootable USB drive for ISO/WIM/IMG/VHD(x)/EFI files. With ventoy, you don't need to format the disk over and over, you just need to copy the ISO/WIM/IMG/VHD(x)/EFI files to the USB drive and boot them directly. You can copy many files at a time and ventoy will give you a boot menu to select them.
Not old, either. My old desktop that I gave to my younger brother has an optical drive. Whenever I have spare money laying around to build and a place to put a desktop, it's going to have an optical drive. Not having one, at least somewhat reachable makes me anxious. I use it probably less than once a quarter, more like twice yearly, but when I need it, I need it.
Honestly, a better solution would be an open-source IODD-type device, because sometimes I still meet old devices which do boot via USB DVD drives, but not flash drives.
But Ventoy is a second solid choice, especially with newer devices, where such limitations are basically non-existent :)