I am either understanding you incorrectly or you do not understand Blaser R8s.
There are 2 systems that Blaser stocks work into. A steel or aluminum receiver that the Blaser internal chassis is integral to and a aluminum or steel internal chassis that is integrated into a synthetic stock.
You could pay someone to take the synthetic stock off and replace it. There are a ton of aftermarket companies mostly here in Europe that offer either carbon fiber or wood replacements for the Professional, Professional 2.0, Professional hunter, and Professional Success rifle stocks.
The Luxus, Jaeger, Selous, Intuition, Attache, Success (wood stock models) and ultimate X, and Kilombero have a two piece wood, synthetic or carbon fiber stock.
What you most likely want is the entire stock and receiver.
For the cost of the upgrade, you might as well travel to a dealer and hand select what they have in stock (pun intended).
There was a wood classic stock version in the professional system that they had to discontinue because of the number of them that cracked. As the wood was too thin.
There are two Blaser Dogs.
Mad Dog and Top Dog.
I recommend Top Dog, his name is Van.
Mad Dog has a bigger selection by a long shot.
I also recommend as others have done calling Blaser HQ in San Antonio and they can't ell you who has what.