Removing the brown ones from a bowl of M&Ms is a 5 minute job that can be handled by anyone. I would expect a lot of people would go "well that's a bit eccentric, but if it makes the band happy, why not".

I doubt the band would say "you didn't redline this weird but inconsequential request, we can't work together.

If they wanted to be sure the redlining process worked, they should have put in something like "remove all fire extinguishers from backstage".