I drilled holes in the back of the head and installed some hardware. I think it may be generous to call what I installed “hardware” since I just bent pieces of peg board shelving brackets into what I needed. It nevertheless works.
Just to give you an idea of how the belt loops into the hardware, here’s a picture of the belt doing just that.
You may recall that the head consists on two parts: the horns, and the head itself. At some point it’d be fun to mold a pen into the horns, so you could detach them and write a mephitic contract.