There's nothing? Perhaps you should give the IBMT a call or drop them a line and see. There may be something you're not aware of. I knew of the names of some of those from Aberdeen and their background but only snippets and hearsay, more of their exploits before leaving Scotland, than when abroad. It's a fascinating story.
There's a small memorial service every year at the monument for the spanish volunteers here in Copenhagen, and I believe that they're represented by the Horserød-Stutthof Union, which is a gathering of ex-kz prisoners and their children, but that's about it. For some reason the Danes have a very ambivalent relationship with those 500 countrymen who fought in the SCW, as they've been granted a prime spot in the Churchill Park (oh the irony...) at Langelinie, a very prominent location, but on the other hand it's not something anyone to right of the local communist party ever makes a deal of.
Anyway, not wanting to start a debate, I'd just like to say that I think the Scots are doing a good job of it, and I'm glad to see their story is taken up for all of us to read about.