I love seeing history restored. My closest to a wz29 is my 660 1940 "K98k" that still has 1939 and 1940 markings from poland before Steyr got their paws on it.
I did a repair similarly on a bubba-ized original turked gewehr 88/05/35 stock, and on an 88/05... Lucky to find on ebay cracked stocks that were good in the areas i needed...the joints are hidden by the front barrel bands, you absolutely cannot see the repairs!