editing a preset font

I really like the Palatino Linotype font, but I run into spacing problems when writing Chord Symbols because of the gaps writing accidentals creates (picture below). Through reading past forum posts I've found that I could just switch to a font like FreeSerif that doesn't have these spacing issues, but if it's possible and not too complicated, I would love to edit the Palatino Linotype font to shrink down the space around the flat symbol, just because I like how it looks. I understand this is a bit of a strange question and perhaps this isn't the best place to ask a question about editing fonts, so if that's the case please feel free to direct me somewhere that would be better suited to answer. Thanks everyone in advance!