Hiding the brake reservoir

So, I already ordered a set of mini m.switches to clean up my handlebars. That got me thinking about the brake fluid reservoir ... I'd like to put a remote master cylinder somewhere out of sight so it's no longer on the handlebars. I found a system but that's for a single disc set-up (Grimeca Clean Bars Remote Master Cylinder), and the XJ has a dual front disc.

Has anybody here done something like that (probably yes)? What parts did you use?

 

My bike has a GPZ550 m/c on it - not sure it matters much provided the piston 'push' area is similar.

 

this may be an issue

Kustom Tech Grimeca Brake Master Cylinder - Revival Cycles
https://shop.revivalcycles.com/kustom-tech-grimeca-brake-master-cylinder
The folks over at Kustom Tech purchased the remainder of stock when the Grimeca factory closed down, meaning these NOS components are limited and hard to come by. These master cylinders are available for both 7/8" and 1" bars with options of 12mm bore or 14mm for the master cylinder. This brake master cylinder …​