Hey Jason, I was doing some research on three point backhoes and some have their own pump driven by the pto shaft.
The ones I were looking at (liberty) were 5 to 8 foot models and the recommendation was for horsepower to drive the pump on the backhoe.
These models recommended 30+ horsepower.
There may be some available that run off a remote from the tractor but I haven't found any yet.
Hope you find something that works,