What's the Scottish equivalent of the prefix "Anglo-"?
Solution 1:
By analogy from Latin Hibernia giving Hiberno- for Irish, perhaps Caledonia could give Caledono- (so Caledono-French or Caledono-European)? This doesn't seem to be attested that I've been able to find though, but I'd expect it to be fairly well understood after a moment's thought at least in Scotland and probably in most of the UK.
Alternatively given Scotia is also ultimately Latin, Scoto- would probably also fit the bill here, at risk of not sounding quite as poetic (and possibly being read as a typo for Scots-).