[wp31s] simple equation editor ?

[Stephan2]

If necessary there could be a variant with the equation system disabled, possibly called
wp31se (scientific equation) vs. wp31s if they need to be recognisable from the outside.
There already are a number of firmware variants.

Ultimately it is an open system - anybody can run anything on it. Short of verifying the
firmware in depth, you can only trust the student or ban flashable calcs completely.