Hatsan Hercules Moderator???

Neil could custom make a LDC that connects to the shroud. I'm thinking it would make the gun a lot longer though. On a couple of my Hatsan QE guns I just removed the shroud and put on a screw on LDC to the end of the barrel, You could try to reduce the hammer in order to dial down the power. It should quieten the gun down some but not sure it will make it backyard friendly.