Hawk with Removable Attachments?

[mdcaldwell&co]

I really like the Benchmade & K5 hawks with their built-in prybars, but would prefer a full-sized hammer head on the back. I was thinking about building my own with a bolt-on hammer head that could also be replaced with a bolt-on spike. Does anyone already make something like this? If not, would anyone else be interested in this concept? I'm thinking full tang 5160. Any suggestions on max/min thickness, weight, OA length, etc?