Futzing with an Ischell (or other body mount pickup) night after night might get old but may be the best solution, depending on how loud you need to go. Yes, the Band and the big and heavy Realist block thing are not too good, IMO. The wing pickups may need bridge modifications to install.
I would just ask for your basses to include a pickup! You're willing to play strange basses so I wouldn't be too concerned about the pickup supplied. And you can always ask about the pickup beforehand. I suggest bringing your own pre or small amp head to help get your sound right.
Good Advice,
Thing is if you have a Headway EDB-2, Grace Felix, or even a HPF Buffer Pre Amp you can really improve the sound of the existing pickup whatever it is.
Ric