SMuFL: Primes and Sub-Primes for Helmholtz Pitch Notation

Are primes and sub-primes for Helmholtz pitch notation
<https://en.wikipedia.org/wiki/Helmholtz_pitch_notation>  something that
should be covered by SMuFL? Usually, the argument here would be that this is
something that should be done with the used text font. However, many fonts
only cover primes up to the triple prime, with more ambitious ones going up
to the quadruple. The highest note on a "full-size" grand piano would be a
c'''''; that is a quintuple prime. There probably are only very few areas
where so many consecutive primes are needed within a text notation context –
apart from fancy mathematics, for which usually LaTeX would be used. So I
won’t hold my breath for this need being addressed in non-music-specific
fonts at any time soon.

 

One can, of course, combine several regular primes. But this will often be
unsatisfying with regards to kerning; it probably also very much confuses
today's clever word processors, semantically.

 

Is there precedent for a SMuFL glyph that appears in the text variant of a
font, but not in the regular variant?

 

Alex