I've been away from LilyPond for a few years but my work uses custom
flags which you can set. You can describe any path and make it for the
flag. I don't have my example on hand just now, but fear not, this can
easily be achieved. I'm sure the others will give more detail.
Andrew
Adam M. Griggs wrote on 15/06/2022 1:53 PM:
Just a quick request today, if I may. What I'd like is a stem-down
fusa (mensural-style quaver or eighth-note) with its flag extending to
the right instead of the left. A mirror image of the regular engraving.