. . .Yeah, basic competency in F/A skills - what a concept. For a diver with < 100 dives, rescue diver and no EMT training sounds like a plan eh? Imagine if every non professional diver had basic competency first before chasing the big splashy stuff... But oh yeah, that sounds dull too me too.
For the record, I would suggest Wilderness F/A with a good instructor as a good next step. The EFR portion of rescue diver seemed lackluster IMO. After that perhaps EMT-F or A. The WFA course is designed to treat injuries where delay in transport is expected. I also suggest aligning with a facility or org. that allows repeated training with a CPR doll, preferably one with a ventilation/compression readout.
CPR is not hard but one needs to spend a lot of time honing it so the actions become effective and somewhat natural. I was fortunate to train as an EMT-A in a University setting where we could spend hours whenever we wanted on that skill. Some did, some didn't. I was one of the ones that did and don't regret it.
I have also taken two different chamber day courses learning how they operate and going for a ride. Having learned how a chamber works is interesting in knowing what to expect downstream but won't help the dying diver on the deck of a dive boat. There it's boring old F/A. So, until one has that aspect fully covered...
Call me dull that way. I care about the basics that actually matter instead of trying to get a contact high off of what the cool kids are doing.