I found these, I don't know if they could be made to work for our bikes or not. http://www.injector.com/fuelpumps.php
Although I'm pretty sure it could be made to work it won't be a plug and play arrangement. There are other things that you to consider like a fuel pressure reg.
It would be nice if someone got an external to work. Maybe i can get back some of the fuel space in my tank.
The flow volume rating and current draw is a bit high on those pump. Those pressure rating are max output, you need a precision bypass pressure regulator on the pump output that returns excess fuel flow to the tank. It's certainly possible, but the demand for this option is probably low unless your being told you need to buy a $600 pump assembly.
There will be a need when these go tits up, Some one could make a plate for the supply and return and we would have more gas in the tank