Would it bee possible, as phosphine is a reasonable reducing agent, to reduce ephedrine/pfed directly with either the liquid, and pyrophoric P2H4, made by condensing the gas formed by the action of water on calcium phosphide, the gas condensed by ice/salt in a U-tube, then the remaining "normal" phosphine (PH3) burned led through water then burned off.
Could this, or maybe even on of the solid phosphines such as P2H or P12H6 bee used also?
I should add, that this would NOT be suitable for inexperienced cooks, indoors, of for that matter, anybody without access to a diving air tank and mask as phosphine is EXTREMELY toxic, having irritant effects on the lungs, and destroys the liver after a delay of a day or so,
I repeat, do NOT even THINK about this if you are not 120% equipped to the hilt with all nescessary safety gear, closed circuit air tanks etc. or you WILL end up a rotting carcass floating in the gene pool