this was interesting, saw it on google the other day.
Mira Pedal Strap Adapter - New Blue ? Coach Carl Cycling
I could print these (or something close) off if I knew some dimensions.
There was also a guide (on here I believe) about using old toe straps/cages, chopping up the cage and then fitting it to look (shimano) pedals. I tried that for a project a year or two ago, worked really nice. I can take some pictures later if you want, it was simple, just some $15 cages, a dremel and an hour or so. Modification also isn't as "permanent" as the drilling/tapping method.