They make a 9" barrel for Glock 40.
One of my backburner projects is to make detachable should stock for various semi-long barrel handguns that would double as a water/dust proof container/holster.
The idea being like you said a "woodsgun" that you don't need to worry about in rough but with 9" barrel and shoulder stock it should be pretty good. The container would also of course hold extra ammo, etc, maybe even scope.
Guns on my list for this would be Glock 40 in 9", Deagle 44mag in 10", and Ruger Blackhawk in 357/9mm and 22lr/22mag in 6.5" and 9.5".
Paper mockup says a holster for 6.5" Blackhawk about right size for shoulder stock.
Yeah, I know I can't do it in CA (though maybe for Hollywood use), and need an extra $200SBR tax elsewhere.