INTENSE M1 REAR BRAKE again

[dan28]

Look at your swing arm
You have the lower pivot bolt an the wheel qr axle hole
So if you made a piece of flat plate in a kind of crooked V shape using those holes to mount it an caliper would mount to other part obviously work those holes out when caliper an disc is on

 

[dan28]

Just had another look.
I think your best option is an A 2 Z rear brake mount it mount using the qr skewer an the two plates sandwich between the dropout

 

[dan28]

Like this

 

[LeeDevelopment]

This should work but you need to shorten the support rod and get the chain stay clamps made up: https://ebay.us/m/5OLO9W