Yes Alex ,this is what I mean by milling ,having an exactly half fuse plug milled with guides in mdf is way much progressed work than cutting formers out of wood for a wooden fuse!!
There is another suggestion though .You said you are laser cutting the formers.You can also cut vertical slises of your male plug with your laser cutter and join them to form your male plug .Every 20 or so slices you would have to make sure they arein the correct lengthwise position.
You can also split your fuse plug in 3 pieces if you can find a 700mm mill and join them on a board.
I´m throwing any ideas that come in to my mind ,one of them I wish it works for you !

nice work
Elias