My friend, we've been doing IAs so long, they're now a Navy tradition.

😬
Isn't it possible to train SWOs or sub guys to do some of those jobs? I know quite a few of each who would have loved to learn how to be shooters or arresting gear dudes. It can't be that hard to teach non-pilot types how to do it could it?
This would make sense. When I was at 6th Fleet, we were always hurting for MOC watchfloor personnel and battle watch captains. Nobody wanted that job or the N33 job in charge of all of them because the hours sucked and you were constantly in a FLAILEX to answer the FOGOs' or SECDEF's questions and build the 1,111th storyboard slide for some captain somewhere. They eventually started poaching us JOs from the various offices to stand nightwatches.
The Navy does this as well. I think it was actually made official DoD policy a few years ago in one of the NDAAs.