I do not think that you can easily strip out just the parts of Calibre that you want!
Calibre has a very large number of dependencies, and you would need to get all of those onto Android first. You would then need Python itself (is that available as standard on android), and then once that is all in place you could start trying to get Calibre itself working.
Even if all the above steps were successful, it is doubtful that the device would have the resources to run Calibre (I assume that you are talking about a mobile device here?).
However despite the pessimistic tone of the above, I am sure that if anyone succeeded the results would be welcomed
