Good find, I'll be interested to know how you get on.
I was looking for strap adapters for my Casio MRW-200H and found these straps which seemed a better idea.
I went for these.
https://www.ebay.co.uk/itm/235091658...Bk9SR4Kotu64Yg
another option
https://www.ebay.co.uk/itm/285294067...Bk9SR4Kotu64Yg
Good find, I'll be interested to know how you get on.