Well I bit the bullet and tried to do a direct import from Blender into Unity, but Blender crashes. I’m running Blender 2.78a and Unity 5.5.0f3.
Anyway, I exported the FBX from Blender and it didn’t seem to come across very well:
The game view looks the same (although I have no idea how to navigate around the scene in game mode). Nothing has textures at all and several objects are entirely missing.
I did make a reasonable amount of use of linking and proxying, also all of the images for image-based textures are not packed in the blend file (as usual). Any suggestions?