Reddit mentions of Scottish Sport Climbs: Scottish Mountaineering Club Climbers' Guide

First, I hope you both have a wonderful trip, I'm truly jealous of what you'll get to do and see :)

Second, I'd really recommend spending some time in Austria. I was lucky to spend some time in and around Salzburg and the area is absolutely gorgeous, the food is fantastic and the people are lovely. I spent time in a town not far from Salzburg called Werfen. I believe there is via ferrata climbing in the mountains there and possibly other climbing (I unfortunately wasn't into climbing when I was there :( ). I'd recommend doing a salt mine tour as they are quite fascinating and you see some lovely things. I'd also recommend the Werfen Eisriesenwelt Ice Caves as they were absolutely stunning.

Now for the main topic :) for sport climbing in Scotland I've not done too much to make personal recommendations however, I can hopefully help out a little. I own a copy of Scottish Sport Climbs this has some topo maps of lots of different sport climbs and info about the areas and grades (if you check the preview in that amazon link it gives you all the crags that the book covers) I'm happy to send you photos of any of the pages you'd like if there are any of the crags or areas you'd like to visit. You can also use UKClimbing's find a crag to look for other places to climb, though it can sometimes be difficult to just find sport climbing with it.

I hope you have a wonderful time and would love to hear of an update or see any highlights from your trip! :)