Yes, if it's truly 58VDC, it is marginally fine. But if you follow what I wrote in my previous post, adjusting the power supply correctly and permanently to the mic that will be used with it is the better way to go.
I know, it's a pain in the butt to substitute bridging resistors in NG or NG1 power supplies rather than the convenience of a trim pot, but in your case it's quite easy: in case you have the NG1 supply, leave all four 1K resistors (or whatever is in there now) alone, and add a ca. 200Ω 10W resistor before the first resistor, right after the rectifier.
In case of the NG supply, change out the single bridging resistor mounted between the two chokes to a slightly higher value, again 10W rating. It's not that expensive to get a stash resistors with varying resistances.
Big disclaimer and warning:
Do not attempt any of this if you are not well-versed in high voltage eletrics! It can be deadly!