Multiple private ispell dictionaries

I have an application where I want to use ispell and have it use a dictionary constructed from three inputs: - The default language dictionary (in my case English, provided by the system). - A manually curated word list (asking ispell to "insert" a word should add to this). - A dynamically generated list of works. Importantly, the last source will be regenerated on a regular basis, adding and **removing** words which may or may not be in either of the other two sources. - Is there any way to do that will ispell? - Is there any way to do it with an alternative spell checking that has a similar feature set? --- I can sort of fake things by generating a per-use dictionary: ispell -p <(cat local.dict dynamic.dict | sort -u) $FILE But this doesn't work once I need to add a new word to local.dict: ispell has no way to find the original file and thus clearly can't modify it. What I'd hoped would work is to be able to pass multiple -p ispell -p local.dict -p dynamic.dict $FILE But it seems only the last one is even noticed. I've even tried exploiting the fact ispell will use a merge of both $PWD/.ispell_words and $HOME/.ispell_words (which would require overriding $HOME). That actually works for the most part, but it seems that when adding new words, ispell write out the **merged** dictionary with the result that it copies everything from the current dynamic dictionary to the permanent static one. --- At this point I'm starting to consider things like merging the English dictionary and the custom one into a temp file and passing that via -d. But that sort of thing seems to be an invitation for endless issues, like how to reliably find the dictionary in the first place?