Gordon
When it comes to the LW in Norway, i'd go with the Norwegian researchers, like Olve Dybvig, Andreas Brekken and several others. These guys are seriously good. I could ask, occasionally you can find crewmembers. Years ago an Icelandic researcher provided me with operational reports from a crew from KG40 based on an EKI document i have, so it's not impossible.
If you note the stamp on the FFS in gold doc, Fliegerführer Nord (west) you can see he's clearly in North Norway in feb. 44 and as the staffel remained here, its not unreasonable to assume he did too, the june 45 doc is quite typical of post-may 45 'norwegian' documentation, though not exclusive to it of course.