1970s roadracing:
I just center-drilled and, cross-drilled 2 times, a longer bolt, then turned off the threads, sort of like the stock bolt, in two places (used a Dremel with cutoff disc). Then I stacked the two banjos of two stock brake hoses, one on top of the other, with one of the sealing washers in between the 2 banjos. I don't have any digital pix of it, but it's not hard to imagine it.
Then, after racing, I used it on the road for 55,000 miles like that. The lever travel was just less than twice stock, the controllability excellent (except on ice) and no fade ever, even with 600+ lbs aboard and 90+ MPH downhill canyon rides on trips. And, of course, many 1-up mountain race-with-self days...
I gave it up when I went on an unsprung-weight reduction campaign, then sold it when I got married and needed $$$, to another aspiring roadracer.
To do it over on a 450 or 750 today, I would use the smaller ones from the CB500 chassis with custom mounts, to reduce the unsprung weight. The stopping power will be quite adequate, even for repeated 110 MPH slows and stops.