Been watching this video <https://www.youtube.com/watch?v=MYJ8du9TaxE> about a bootloader called “Ventoy”. Basically you install it onto a suitably-large USB stick, then you can just copy .iso image files of all the distros you want to try, and when you boot off that stick, it will offer a list of which OS image you want to start up. This even includes some Microsoft Windows installation images. Not everything is fully-compatible, though.