cant you drill the old nipple out? you can buy nipples with 0.5 oversize for this reason. You can also buy bleedable banjos, they replace the existing banjo but have a bleed nipple built in - i have fitted one and as long as you orientate the caliper correctly you can bleed them out. They look like this:
if you must replace the caliper, do you know the bolt spacing?
There are a number of yamahas with the same ~(i think) 83mm calipers.