Might be worth looking at inland courses as well.
Lots of Scottish-English border towns had courses built in the 1890’s-1920’s - often 9-holers on sheep roamed uplands/moorland. Must be some that would fall into the quirky, rural and rustic variety beloved by many posting herein, eg maybe near towns like Selkirk, Gala, Hawick, Duns, Wooler etc etc. Some might not be too hot but some might be a surprise. Clyde may have some suggestions.
Atb
Selkirk has some stout golf, benched on the hillside above town. I'd driven past it a bunch over the years, and finally played it post-lockdown. The final 150 yards of the par-5 8th is very cool, having played through a channel the green is side-stepped over and beyond the right flanking ridge. The drop-shot finisher is a beauty too.
There's not much to be seen at Innerleithen. It sits in a u-shaped valley bottom, though the par-3 4th brings a welcome funk as it plays sharply upwards onto the easterly hillside. I think this might have been Willie Park Jnrs first foray in golf course architecture!?
Hawick climbs up over three levels, until it eventually sneaks over to the eastern side of a hill above town. Midway up, the 4th is so severely tilted that a wooden board holds shots that have landed in the fairway and inevitable chased into the semi-rough. On the way back down, the drivable 15th has a tiny green with severe fall-offs, and then the par-3 17th parachutes to a double-green shared with the first.
Jedbergh has 9 new holes, but they're amateur hour really. The current 4th is most notable - a drive down from the wooden hut of a clubhouse leaves an awkward pitch from a downhill lie to a green sandwiched between a stream and a boundary wall.
I'm pretty interested in seeing Galashiels, but less so Melrose and St Boswells. It's amazing that all these places still have a golf course of their own.