How can I move the source files of my Apple Music Library on PC without losing any data?

I currently have a setup with Apple Music I am quite happy with. I have music as FLAC files on my windows PC, added to Apple Music on the PC, with iTunes Match enabled so that I can play all of this music on my phone. This is good because music on my PC will use the data from the original FLAC files and be lossless while Apple's cloud system automatically handles converting to lossy data to stream to my phone to lower the amount of data used (My original music library is multiple TB and would not fit on my phone at all).

This all currently works flawlessly. However, I would like to move the physical location of my flac files on my hard drive to a different location, which from my testing would cause a problem. Even though the music isn't removed from my music library, Apple Music would no longer be able to find and play the flac file because the path it has saved would no longer be there. A simple way to update the path would be to delete everything from my Apple Music library and re-add it; however, if I did that, I would lose all my Apple Music specific metadata, most importantly my ratings, of which there are thousands.

So here is my question. How can I update where Apple Music expects to find my FLAC files without actually affecting the contents of my Apple Music library?