I normally only breast them, but I may try your method next time I get a couple- save for the neck/heart/liver. I don't do internal organs of any kind; definitely not ones that act as filters for waste.
Looks tasty though!
You can do this then instead.
Bacon, ginger, garlic, onion, & carrot chopped fine. Pan fry.
Cut the breast meat off and place the bacon filling on the breasts like so.
Then wrap with bacon. Bacon + Bacon = Win. You can do the same thing with the legs just no need to put and of the bacon filling in the middle.
Before you bake it, pan sear it. Be very careful because you can easily screw this up. If you're not up to the challenge then just go straight to the oven. This will make the bacon crispy and the bacon will also shrink as it pan sears squeezing the two pieces of breast or legs together making so nothing will fall out. Doesn't need to bake for long. Grouse is super easy to over cook.
You can boil the rest of the bones in a pot of water and vegetable peels to make a stock. You can still save the neck, heart, and liver for this because there lots a great flavor in it to add to the stock. When its done you will strain it all out anyways. You can also use this stock to make a gravy. Grouse gravy is great for poutine by the way. This is a great method for those who don't like to actually eat some parts of the bird and it will remove all the nutrition from the birds meat and into the stock. Pretty much using the majority of the bird here. I do this same thing with Deer bones.
The soup stuff.
So you will end up with either one of these two results. This one is grouse soup. I use the pockets of meat that are under the birds wing as well as the meat from the wing drum. If I got left over legs left they go in as well. I have liver, hearts, and necks in this soup as well but obviously you don't need to add it. This is my wife's plate as she loves the legs so I save them for her.
This is the other option you will end up with. Mashed Yukon Golds with grouse gravy. In this picture the grouse is stuffed with fruit instead of the bacon filling so you can try either way. Both are very good.