Maybe, but not my business anymore.
What I assume is this:
- ZnCl2/HCl forms a complex zinc-acid which chlorinates the alcohol (says the "Gattermann"). The right ratios and microwaving will push the reaction into the wanted direction.
- Adding more Zn after the chlorination and nuking it will reduce the chloroephedrine, how complete this reduction occurs is unknown to me.
But (pseudo)ephedrine reduction is somehow boring, the P/I and the Birch, two almost quantitative reactions are available, what do you want more?