Try what i do.
Turn up with a B-D tuned Tokai Jazz bass for the audition ( my stealth bass). After a short while, they get weird when your fingers "look wrong" when they shout out the chords to a new tune. If i survive that, i turn up with a five string bass to the next rehearsal which to them is strangely more palatable than a four string with its notes in the wrong place. I did get a weird reaction at a gig once from a sound engineer (at the Camden Barfly so it wasnt entirely unexpected.) She said " WOAH! Its a fusion trap. 5 string bass? Next your drummer will be coming out with a Dave Weckyl Signature Snare...".
Being a Middle Aged Baldie helps though as i'm so far away from "Normal" that a 5 string bass is the last of their image concerns. But standing 6'2" and being 180KG means any bass looks like a banjo on MOI. I used to get all kinds of stick for playing the ARIA SB1000. Till they heard it. And when i pull out the Jaydee and DONT go clackity clack,... Im sure i actually feel the (prejudicial) walls come tumbling down. (I must admit they do ask for the Jazz on photo shoots). So with some people you have to play a little game. I find that when you mess around with their perceptions technically theyre less inclined to "Show" you the basslines , More over i get asked for production input. But one must bat away the twats "getting a deal,Man". Your'e on a hiding to nothing then . outdated ideas from a era time forgot. But thats a whole new topic.....