@ Red Knight:
I would say they are 16g but at 8mm ID they retained their original shape quite well.
I have no concerns that the links will separate very easily with frequent use.
@ Sir Gerard:
That is probably one of the primary reasons I have avoided period footwear because of the
lack of adequate soles and a decent heel with a sufficient arch to allow the spur straps. Be that as it may,
I would concur with your idea and attach rings or eyelets onto a couple of straps under the flat soft soles.
You could either run them straight across or use a crisscross method. I've staged a rough example in the pictures.