It is a reasonable accommodation for a deeply held religious belief, and should be manageable with little effort.
Agree with your post, Furniture.
I've had to risk manage a sailor with a heart condition, who was still fit to sail but not to participate in DC.
Someone else who has a soft tissue injury while underway, also not fit for DC/bunker gear.
And several sailors, concurrently, who were not even NETP-qualified. That one concerned me enough that, when told I was required to request a waiver from higher IOT sail with these folks who were AP'd to me, I decided not to seek the waiver, to make a point. Low and behold, on getting wind of that, higher faked to the left and sent me a message waiving the requirement I hadn't asked to have waived.
So, another dude who can't get into bunker gear? For a CO, its just another day that ends in Y. At least that dude can likely do a whole bunch of other FF/DC jobs that don't require him to get dressed up, so it is likely one of the easier things I had to risk manage on any given day.