There is a tool called Ventoy that can hold several ISO (basically as many as the USB can hold) at the same time and will show a menu where you pick an ISO. And all you need to do in the future is replace an ISO with a new ISO. Not really useful for 4 or 8Gb sticks but a 32Gb stick can hold 3, 4, 5 ISO and a 256Gb stick that cost about 30 euro/USB can hold 40+ ISOs.
The list of supported ISOs is very long and includes, besides Ubuntu/Debian, Redhat, SUSE, almost all spinoffs, also all Windows, and several ChromeOS. And then some. I have been using this for a couple of months now and can confirm Budgie 22.04, 22.10, Cinnamon 23.04, Kubuntu 23.04. Ubuntu Gnome 20.04, 20.10, 23.04, Windows 10 and Windpws 11 all work.

woeusb
. – sudodus Jan 09 '23 at 21:00