I have never even seen a musky, except in pictures, so this is just a question based on my building and fishing lures for largemouth bass and stripers.
I use an 80# rated swivel for my belly hook hanger, set in super glue with a piece of spinnerbait wire passed through the buried eye that runs side to side, just for insurance. because, if I get careless, and allow the super glue to enter the barrel of the swivel, the wire will fail before the swivel body can be pulled out with a pair of pliers.
I like the swivel belly hanger because it seems to keep the fish from using the weight of the lure to lever out the hook. It provides enough freedom to allow the lure to swing around and embed the tail hook into the side of the fish, which really cuts down on their thrashing and fighting.
For you guys who build musky lures, do you think that method might work for you?