I play around with fonts a lot, and sadly these tools stopped working for me or worked inconsistently. I believe the only variant that worked perfectly was an old version of the Koboify script paired with one specific (old) version of FontForge. Which is a shame, because a fully working tool would be a huge time-saver! (Fingers crossed for Sherman.)
In the end, the most reliable method is to install FontForge and learn its quirks. You can always check that PANOSE is properly cleared and that font names are the same. Depending on glyph size and the degree to which one emboldens fonts, it is possible to bork certain glyphs. FontForge will display a preview so you can actually fix the issues, or at least diminish them.
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