Acck. I really ought to look things up before posting. Turns out Afghanistan and Cornwall are very nearly identically far from Crete, about 4000 km. It’s about 2500 km to the Ore Mountains. To Galicia you’re back to that 4000 km.
I suspect tin was precious enough that the major civilizations in the Middle East used up any that reached them from Afghanistan rather than shipping it on to Crete.
You have an “easy” ocean route to Spain and established trade routes to Sudetenland. I’d never say Afghanistan was easy, unless It was during the Maurya Empire and then the mountains would have made things difficult, to say the least. I’d stay with your first post.