A Possible Reading of "rapa (turnip)" on f102v2

[ololololo]

This approach will not be difficult for the decrypter. If I encrypt APPLE as OLUIA, and the L character has the values P and H, I think you will understand that AHPLE is the wrong decryption.

But what about pot/hot, put/hut, peel/heel... ?

I was asked a similar question by @oshfdk, but he was asking about anagrams of the words made-edam, etc. If you have context, there are no problems with similar words
Suppose we have a symbol 1 that encodes p and h. 2 encodes ot, and I'm too lazy to encrypt the rest of the words
In general, you are given two phrases:
12DOG
GREEN12
I think it won't be difficult for you to figure out which letter is equal to 1.

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And when talking about "low number of characters": what is the number of characters exactly?

It is likely to be less than 25-26, i.e., less than the number of letters in the Latin alphabet.