I carry a little Barcus-Berry instrument pre-amp for using with such pickups. If I need a direct signal I can sometimes get it from an amp direct out, but they tend to be noisy and not all amps have them. It's not great, but it's better than nothing and quieter than a buzzy amp feed.
We're going with bass through monitors. Amp sounds like crap and gets lots of feedback.
The reason I was thinking of the crown was that I could have him wireless with a spare pack.
He hasn't played that bass in years and if he doesn't practice more I may do the flame test.
So blue flame if it's real wood?