Here's how I get beyond that ..
I take the project to RB, and generate about 6 tracks of bass to pick through. You may be pleasantly surprised to find you have a good variety (a lot of the time), but all played on the same bass and recorded the same way so they fit together well.
Then I cut/paste a bass track together using pieces I like.
Either that or I just play what I want on bass ... depends on how lazy I'm feeling.

I can't expect the realtracks to play exactly what I want.. and I can't talk to the bass player .. but I CAN have him play it a few different times and comp a track I like.
Use whatever tool gets the job done.
just an idea