Sorry it felt under radar...
yes, this does work!
however I managed to encounter two more bugs along the way
Pharo space: everything is underlined/bold as expected
Bloc space: no styling (this is same behavior both before and after loading Free Type)

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And second thing (that may not be so obvious from the screenshot) is jaggedness of the font in Bloc (that's why I was messing with fonts in the first place).
I suspected that Font Hinting (Settings > Appearance > Use Free Type ... > Advanced Features > Hinting) was incorrectly configured,
however when I tried to change it it had no effect.
So my conclusion that fonts are not yet fully implemented or something else is missing? Or is my system/configuration wrong? (The image is Bloc build #609 from pharo-contribution).
I actually have the very same problem in text rendered in Roassal (Athens canvas), so I blame Athens. Is there a solution for this?
Thanks,
Peter