In reply to TeHut:
Exactly how much toe/foot hooking do you do? For the tops of your shoes to give up before the soles wear out, or a crystal punctures the toe rand?
I wonder what Dragons Den would say?
"Its a niche product to solve a virtually non existent problem, for that reason, I'm out!"
Or "Just buy shoes without velcro when climbing Finnish granite?"
Though I joke and can't see a use for it myself, I wish you luck on your endeavour.