I am an AVID grouse hunter and NEVER use a knife to clean the birds I take!!
Try this....lay bird down on back,spread wings...stand on wings where they meet body....hold both feet in hands in pull up,all that is left is beast meat with wings attached.
Returning to camp use SHEARS to clip wings off at body.....total time involved in cleaning a dozen birds.....less than five minutes!!!
I would carry shears and complete process in the field, but need to leave wings attached as spruce grouse are protected where I hunt and wings attached prove species as ruffed grouse if stopped by game warden.
WHERE DID YOU HARVEST TWELVE GROUSE.....UNHEARD OF WHERE I HUNT>
GH