That's a good idea. I currently have Neal working on an Anschutz 5109 trigger for me, and I could ask him about the best plan for bedding a Walther. Unfortunately, his being across the border makes it pretty well impossible for me to have him do the work. I know Henry Rempel is good with Anschutzes (I had him bed a 1712 for me a while ago); I wonder whether he's done some Walthers.
Henry might very well be the go to guy. Another contact might be Wayne or Arne Sorenson in Calgary. Wayne was dealing Walthers a few years ago and still may be and Arne IIRC did shoot them in the 70s. I don't have contact info for them