How to Change the Dual Dimension for a Select Few Dimensions but not all Dimensions?

Hi all,

Got a drawing showing installation heights and whatnot for a product install. Primary unit is "feet & inches" which I have rounded to the nearest fraction, and secondary is "millimeters" with no precision. This works as intended, however, on bigger dimensions (Like 5' and up) I would like meters to display instead of millimeters. I do not want to change the entire document dual display to meters, however, since most of the dimensions in inches/millimeters which I want. I tried going to override units since this is only a select few dimensions that I need to change to meters, but I did not see a way to change the dual dimension, only the primary.

This question seems very google-able but all the results are people asking how to change all their units, not just some.

Any help is appreciated. Thanks!