Get numbox to display flat symbol in MIDI display mode?

I am working on a basic note naming interactive quiz of sorts for my Fundamentals of Music course so that students can quiz themselves outside of class.

I have a number object displaying MIDI pitch values, and I have a nslider alongside it displaying the pitches on the staff.

Nslider will display a pitch enharmonically by multiplying the pitch by -1, and this works great for testing students for enharmonic equivalence, but if I were to quiz them and ask them to identify the note displayed on the nslider, I would like to be able to have them input the flat value if it is displayed as such in the nslider.

I'm sure I could use Bach to try and develop this, but I don't have the time to dive into Bach, and I feel like employing lcd and attempting to call upon the flat symbol ASCII code in a notational font set would be equally time consuming and messy.

There has to be a way to get the number box to display flats, particularly if the nslider has the functionality, right?