Here we don't even put names on the ballot, instead there is number assigned for each, this scales up to hundreds of candidates. This does prevent write ins, but I see no reason why you could not have own ballot for each purpose and then say colour code them and append letter or two in front of each candidate for each election.

I don't see how the median voter can be confident in making no mistakes. Not even programmers are willing to write out a list of opcodes anymore.