Ventoy is an opensource tool to create a universal bootable USB drive for ISOs and other image files.
With Ventoy, you don't need to format the disk over and over to create a bootable USB for different images, you just need to copy the image files to the USB drive and boot them directly via a dynamic menu.
Hmm, looks like either the ISO has been discontinued, or I can't seem to find it anywhere.
Anyways, if your intention was to try out SteamOS on a PC (or other handhelds), then a better option would be ChimeraOS, which is a community-made SteamOS with more features and better hardware support, and there's also Bazzite which is even more tweaked with goodies.