I'm also looking at doing this upgrade. Did both lines on my Harley but have been hesitant on the Busa because of the abs. I know on GM cars it's almost impossible to bleed the abs without a special tool (tech2). Nothing special required here? I do have a vacuum bleeder.
No special tools are needed, I have bled motorcycle abs brakes and it's done the same way.
The only thing different is that you will have to bleed the abs pump as well, and it has no bleeders, so you will have to open/close the line bolts as if they were the bleeders(hold a rag over them to prevent fluid from spraying out).
If you don't bleed the abs pump, you'll watch the air push fluid back into the master cylinders, as the air pockets are between them and the pump.
I think the front MC on yours has a bleeder, but the rear does not, but if not, again, just open/close the line bolts going to them as if they were bleeders.
It's easy.
Also, if you don't know; regardless if you have abs or not, after you're done, it's a good idea to pump the front lever and ziptie it to the handle bar keeping the brakes applied(put cardboard around the grip to prevent the ziptie from damaging it).
Pump the brake pedal and hang a small weight by a string or ziptie to keep the rear brake applied.
Leave it this way for several hours(overnight is ideal).
Then, hold each brake as you remove the ties and open each bleeder again.
This Always gets more air out, as having the brakes applied for so long causes the rest of the air(that normally wouldn't come out) to slowly move to the end of the lines...the bleeders.
You'll always get another small spit of air out, and rarely have to add any fluid, unless the was another large air pocket(not common).
This ensures the best lever and pedal feel and gets All the air out.