Hi there.
As our experts stated, it’s releatively easy possible to use a (external) SSD for installing.
If you will, you can give Ventoy a try.
With it you just have to prepare the drive, and then it’s just copying the desired ISO(s) onto.
I use it mostly as a convenient way to carry around (and show off) some of the popular distros, just in case someone wants to see, or has a problem that needs to be fixed.
I did installations with the Ventoy drive (which is an external USB-SSD), it runs just as if you used a DVD or regular thumbdrive.