JonnyDunk - Comments

If you want, you can either use the sortitoutsi FM database tool to find individual persons' UIDs or you can input a team's UID into the cut out player faces search tool to get a quick look at all the persons contracted to that club, their cut-outs and their UIDs.

The "Translate file names to IDs" function is intended to automatically rename filenames which contain the person's UID as well as some other text (e.g. assuming Messi's UID is 123456 and you have a config file with the right line of code but a cut-out titled 123456_Lionel_Messi.png, ticking this button and putting the image through fmXML would see it renamed to 123456.png)

Unless I've misunderstood you, that is exactly the way the faces megapack works. The only difference is that it's done by many cutters for many images over many years. fmXML helps in then creating the corresponding config file.