I personally would think this would be highly likely to be misinterpreted. Is the accidental modifying the root or the suffix?
My problem with Roemer, aside from the fact that it was developed for use with music that only uses all caps as I mentioned above, is that the shape of the characters doesn’t help with recognition, so they eye actually has to read it. If I use small caps MA and MI for major and minor, just using the outline of the shape, what chord symbol is this?
For contrast, what chord symbol is this?
MA and MI literally need to be read, especially since they are roughly the same length and start with the same character. Using m for minor and maj for major, the eye recognizes the difference and doesn’t even have to actually read it, speeding up interpretation.