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elizilla,
it sounds like you are trying to reinvent the wheel. Changing epub fonts is a well known procedure, you don't need to research anything. (randomly removing semicolons and parts of the path is a bid strange way, to be honest)
There is nothing special about Polish characters, if the fonts that you are referencing contain them, they will be displayed. (provided, you correctly reference them).
Custom firmwares (I wouldn't call PRS+ "russification", it doesn't focus on any particular locale) could help you in way that you won't need to edit every epub file.
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