I actually enjoy the contracts that push the boundaries of what’s possible in the game. It’s pretty fun figuring out the different puzzles involved to solve these contracts. Might I interest you in “The Jeremy Blackout Privilege MK III”?
The Violin is actually extremely useful in getting out of bounds with the “briefcase + breaching charge” trick. Most use muffins, but that only seems to work ~50% of the time for me. With the way the violin breaks into larger pieces with collision, it’s much more reliable and consistent for me. But that’s literally the only use I’ve gotten out of the Violin unlock.
I think all of us are currently out of luck on the Claw Hammer. I think it’s still missing in the inventory in Hitman 3 for everyone, even for those of us who ported everything over from Hitman 2.