As I said, it depends on how one intends to use a spot meter.
One needs to ask one's self what the goal is that led one to the 'need' for spot metering in the first place.
I can take a half dozen spot readings on my OM-4T, marking highlights and shadows, which could take a minute or two. Or I can let my OM-PC measure all those spots and come to the same conclusion, in a microsecond.
I offer an alternative that may well suit the OP's goal.