Food for thought...
Track a bass DI
Hi-Pass the Bass DI and reamp it with the GTR amp using similar setting as gtrs but probably a lot less gain. Pay attention that this does not sound totally divorced from the DI tone. It should not sound like a separate instrument.
Then mix the two, Bass DI Low Passed and the Reamped Bass High Passed, varying the Filters.
Parallel compression can really make this work got you.
This new Bass mix can now mix very well with the gtrs and can become an extension of the gtrs.