I don't think I'm getting it right, but isn't it just a matter of checking the character set in the query and determining if it belongs to English or Devnagri part of Unicode and applying transliteration if the query is in English.
If you are looking for a self hosted Devnagri transliteration tool, look into AI4Bharat, a tool developed by IIT Madras.
sounds like you want a MultiKeyMap and a way to store the data from which you build the map, so i'd suggest to look up that data structure. incremental search could than be implemented by filtering on the key sets or subsets of it.
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