I know you tried everything, but did you try these?
https://fortnine.ca/en/ebc-double-h-sintered-brake-pads they made a big difference for my modded 750, with a firm grip it will unlatch the back wheel from the pavement on a panic stop, no stoppies though unless an inch counts.
I don't know, but this is what I think:
I think you are going to have to do a front end swap with another bike complete with wheel, easiest I think would be something with the same fork diameter (41 mm?) to retain the stock triple tree and most of the controls. Looking for the right length will save the hassle of having new tubes made to preserve the geometry. You may or may not lose your speedometer drive, there is always GPS as a possibility and the fender will probably require a rework. With the stock fork spread with the stock tree I would expect most double disk wheels would slide in there with appropriate spacers.
It is probably going to take some finding and hands-on measuring at a friendly used motorcycle shop or the recyclers.
This might help narrow things down:
Compliments of "a member on another forum", Sorted by size, find yours and you can see what else shares the same size for a swapping donor. JAP bikes Fork Tube Sizes Fork Diameter Make Model and Year 27 Honda MB5 (82) 27 Honda CR-60R (83) 27 Honda XR-70R (97-03) 27 Honda XL-70K (74-76)...
www.dotheton.com
And oh yes when it comes to Harley-Davidson fork sizing, I think one day
@Froth mentioned they are not what they seem, made to the closest imperial size hole and do not interchange with real metric sizing.