Tripartite Palindromic Partition of Integer (HP 50g) Challenge

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String-based conversion, mhm ... pray forgive my doubts, but have you checked if that works in bases other than decimal? Because I haven't seen a knob to turn which makes builtin number-to-string and string-to-number commands work in e.g. base 101.
And I'd like to know how to unambiguously represent any base 9999 digit with one 8-bit character.

That is to say, for the purpose I wrote them for, I believe my versions still have an advantage. I would be glad to be proven wrong.