I was thinking about this too. I was thinking about a mold filled with bronze powder and binder that could be microwaved too fusing temps. Had this idea since I saw this site. http://home.c2i.net/metaphor/mvpage.html
I believe the key to the metalclay is the size and purity of of the metal particles. The average person wouldn't have anyway to grind the metal into the micro sizes. Bronze would have a higher fusing temp and mixture of different types of metals that would complicate the process.
Sinstered bronze gears and parts are possible, but they undergo a high pressure molding process before they enter a furnace for fusing.