B
/C C D; 29-EDO has A B
B
/C
C
D. It makes sense to use the for -9 negri generators, but we'll need for -19 so that we can spell the minor third as D : F . So for +10 generators, I think it makes more sense to use 
. So we could notate the 9-note scale from A to G as A B B/C
C D E E/F F G. Here's a list of suggestions for other intervals:
. One different suggestion I have is to use 
for +10g, based on extending the mapping of the 124 to 126 cent generator to ⟨0 -4 3 -2 14]. is used in 48edo which supports Negri temperament. This mapping of prime 11 also allows 
for -18g. I'm not sure what use you see for +1g and +11g, but the prime 11 mapping allows 
for +1g. But I don't have any unaccented symbol for +11g, or even a good symbol to drop the accents from.gens symbol --------------- -4 C:G etc -8 C:D etc +20 B:C E:F -28-19
gens symbol --------------- -9
for +10 and for +1. I'm working on the score for my Negri piece now and I'm using the +1 to make sense of the note spelling for voice leading purposes (see the image where D is followed by E ) using A or F with G, if there's ever a need for that. major: in the first bar as some kind of A leading up to the B in the next bar, it would have to be A +11. But it might be easier to just leave it as B in this case, or rewrite it in F
major. I haven't yet figured out whether the piece as a whole is better written in E minor or F minor. notation does seem simpler, at least in those few bars. But I'd hate for the decision to be forced on you by the lack of a symbol for +11g (175 ¢ when the generator is 125 ¢, i.e. in 48edo). The only suggestion I have for +11g is 
which is really a symbol for -37g (assuming the mapping I gave above), which is only the same as 11g in 48-edo. But if you are unlikely to ever need a symbol for -37g it could work. for +11 as it literally means = -9-28 = -37. I guess it's fine if the piece is explicitly in 48edo and you use other enharmonic equivalences of it (but in this case why not just notate it in 48edo...)
works if we choose to represent 19 with -17 generators (although +12 gives a much better approximation, unfortunately no symbol for +11g) and :~X: works if we choose to represent 23 with -43 (although +34 gives a better approximation, however it's positive while most other primes are negative, so -43 may be acceptable).
, 
and . Each of which can be used as is (I'm too tired today to think which one would be the best), but I wouldn't recommend either of those to be used with the accidental dropped, as has a really strong 7-limit connotation (that contradicts its usage as +11g), and and seem to already be used, for +1 and -18 generators respectively. This makes me like the most as the literal interpretation works for it with -18+29 = 11 (because the schisma is -29 generators in negri), and is also the true meaning of this Herculean symbol. is problematic because the accent points in the wrong direction, as the schisma is negative in most of the Negri EDOs (in particular any Negri tuning with flatter fifth, or equivalently, sharper generator, than 29), so this leaves is only with where the accent points in the right direction. Another option would be to notice that the accent is actually worth +10g here, so if you can have many accidentals on the same note maybe , or conversely, 
, would be better.