Use CTC beam search decoder with subword encoding.

I'm using the scorer generator provided `generate_scorer_package`. I'm also using (e.g., SentencePiece) to build a unigram language model, where the decoder predicts the size of the language model. How can I adapt the scorer such that it supports sub-word units? Will scorer work if filling the alphabet file with the sub-word units? Or shall I rely on some tricks like encoding the unigram language model using an ASCII table and re-encoding the corpus and use the alphabet based on the previous encoding mapping? Thank you.