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I emailed Ian about getting hold of some kangaroo leather for strops since he was selling laces made from that. He promptly replied that was possible and all I had to do was send him the specs and...

Looks like a great Canadian source for strop leather. Even has a specific page for that:
https://www.oaleathersupply.com/collections/custom-cut-straps/products/strop-leather?variant=1152718176262...