My hubby is a quant. There are a lot of opportunities in wall street for quants. A ph.d in math, physics probably will get you a better start but since you have a engineering Ph.D., at least that shows you have good reserach ability. Master may start with lower salary but if you like the finance industry and are willing to put in your efforts, nothing is impossible.

There really isn't special constraints on PR or H1 for fianance industry though so don't worry about that.