Sorry not possible other than modifying manually
You could override units on the sheet you would like the units to be different from the other. If you click a dimension and selects other click override units you can change it to inches/mm on the sheet you want to have different units. you could also have two seperate drawings for the same part, inches on one and mm for the other because units are selected per. document.
So i have two options.
1. Override dimensions and modify bend notes by hand.
2. Make a separate drawing file.