Does the interface that you have now work under Linux? Linux has pretty good support for a lot of things now, so you may be able to use what you have. Reaper also has a generous free trial, so potentially this is a free experiment. (I’m no expert and just tinker with this stuff, but I have Reaper and I find it similarly easy/difficult as every other DAW I’ve used) Several distributions have “live images” where you can run it from a flash drive without copying anything to the hard drive. I don’t know if you could set up Reaper and your interface from a live image.

If you do decide to do an installation, consider buying a different hard drive and installing Linux on that. You can install both Windows and Linux on the same drive, and it’s not difficult, but it is slightly easier to use a separate drive and they are not expensive.

I have used Linux and Windows a lot, but I have only used Reaper in Windows, so unfortunately I can’t say whether it’s a similar experience.