Hmm... post from the bottom of the first page:
--------
've done it successfully, I have a pair of clipless converse now. Buy yourself one of these
Those plates are the key. Moding the shoe is relatively easy. Stiffen the sole with 3/8 inch steel plate, the full length of the shoe if you can. Cut it into an insole shape as close as you can, although if it's not perfect, it will will work. Pull out the insole, and about 3/8' of the padding underneath. Slip in the plate with a layer of your favorite adhesive on the underside.
The real problem is I have not found a way to allow for easy (or any) adjustment, so get your cleat placement right the first time. Go for a long ride and the pedals will leave a nice mark so you know where to mount the cleat.
Notice how the plate has two sets of holes? I used one to mount the plate to the shoe, and the second to hold the cleat in place.
Once you have the cleat plate mounted, put a light coat of rubber cement on the insole and place them in.
They worked pretty darn well if I do say so myself, but it took a bit of playing around to get it right. For one, while aluminum is lighter, it doesn't like being flexed...
-------