That is just a bandaid. For the price I would just change the line.

I've been quoted 900 for seafreight and some pieces are sold out. A john I know talked about replacing the lines with flexible local lines measured exactly the same length. Maybe I should try the so called "damper" connectors.

Do you have a leak or not?  Where is it leaking from, master, slave, lines, etc?  Bars might help temporarily but it'll just start leaking again.  Don't waste your money.  You also need to bleed the system properly after accomplishing the repair.  $900 to replace a couple of hydraulic line?  Is that some kind of joke?

I can't tell if it's leaking or not, only symptoms pointed to it, and the possibility of the spring fingers relaxing after sitting requiring another adjustment.

Update: I stopped using NISMO slave and pedal bracket, and programmed a really short throw with factory parts how I got it.