I could see them being the first to purchase export MH-53K's, but I doubt the CH-53E and/or MH-53E will ever go up for sale, even when replaced as they are just too worn out to be worth it.
MH-53E was an item that was brought up during the Bush Jr. administration. If ROCN wasn't going to take it then, it's extremely unlikely that they ever will take it.
I don't know which one I'd like better for airborne mine countermeasure, MH-53K or MH-60S (so as to also be able to use the vacant second hangar on Cheng Kung a.k.a. O.H. Perry class frigates).
I could see a San Antonio being upgraded like this, medium calibre gun or even an AGS, perhaps a VLS and improved sensors, maybe a CEAFAR Mast.
ROCN feels inclined to arm their ships this way because it's unlikely they will be procuring any equivalent of the Arleigh Burke class DDG. Equivalent of LCF is much more likely.
Featured word- inclined. The recently commissioned AOE was to have a Mk.75 gun as well; and then the ship gets a Sea Chaparral launcher instead.