Thanks roubaixtuesday a good suggestion [second hand]...but not having a car makes this next to impossible. I live in Brora.....
Most
Ebay sellers and the like will courier, though a test ride might be challenging!
If you do go cycle camping on your current bike my
two three suggestions would be whatever the smallest chainring you can get on there, largest cassette, and the strongest rear wheel you can get built by a touring specialist.
Will be brilliant, maybe just a few walks up steep bits worst case.