It seems pretty unlikely that Salt Away or Salt-X would damage your regulators, especially if you dilute it enough and limit contact time. I seem to recall the dispenser sold with Salt Away for rinsing marine gear and marine engines, dilutes the Salt Away by a factor of 500 or so. That's basically a large thimblefull per gallon, so not much. The formulation of those magic cleaners seems to have remained a closely held secret, but they're rumored to basically be dilute acid, not unlike white vinegar/acetic acid - which by the way is recommended for use at relatively higher concentrations it seems.
However, it also seems likely that they are formulated with other components like surfactants and possible other agents, as they are claimed to leave behind a protective residue.
That last part gives me pause about using them on something I'm putting in my mouth and lungs.
If you want to boost the salt cleaning power of warm water, why not just use vinegar, or some other dilute acid? At least you know it will rinse away completely.