It just be a 10/22 with the trigger moved forward. Still be a 10/22. Most bullpups the stock contains key parts for the gun to function. RCMP doesn't even allow alot of bull pup airguns as that all they are. Gun with a linkage for a trigger forward.
By all means I don't EXPECT them to approve such a gun. I wouldn't be blown away if they DID though, because they seem to make it up as they go.