My 'M' 'D' experience is similar to your take.
That's not the issue here, though. The issue is analogous to the Brompton Cocktail cock-up - whereby US MDs *cannot* prescribe its most effective ingredient (heroin / diacetyl morphine) but must use the Disneyland pharm-chem PC substitutes. Data be damned: DEA + maudlin sentimentality Rulez the stunted Murican psyche.
This is about the (equally unavailable option) of using the same 2-stage process used to humanely off (other) animals - the first shot is a nice feel-good narcotic which produces unconsciousness; the second is lethal via mentioned K/Na imbalance - intentionally.
(Ms. Gray died in my arms (a neat, feisty cat - with mouth cancer from a #&^$& "flea" collar) with her face nuzzled into my hands, even before the feel-good shot. It would have been criminal Not-to have ended her suffering. But then, animals deserve the better treatment in these circumstances - they've never built a nuke, so they are morally superior, hence deserve the Best.)
It took less than 2 minutes, allowing for my insistence that she enjoy some final period pain-free, before the end.
Fundies will continue to obsess on these and all other issues, while perpetually ignoring all grander issues (like say, the 100K+ casualties of all ethnic stripes including WASP, in just our first pair of Neoconman Wars).
We see there is no solution to the latter; probably not to the former, for any foreseeable - given the demise of any sort of Representational Republic.