Thanks Dan:
I was looking at this tool in ArcGIS Pro, but it seems to want direction offset for one direction, whereas the formula I have requires two...unless I'm missing something:
I was sure that the way to do this was to create a custom projection, but I cannot find much anywhere that explains how to do that. That and the direction offset options are dd, dms an ra...whereas the output needs to be in UTM.
I think the problem right now is that I have no idea how to use this Corrections tool LOL.