Bookari for sure is not ignoring the books original stylesheet, it renders very faithfully to that, for paragraphs, headings etc. but adds its theme. This is with android tablets.
I do have to pre-strip explicit line heights from book CSS, like i used to have to do for my kobo reader, so that it can work its magic properly.
I learnt from kobo days to always strip explicit line heights and font family , i have a handy regex for the former and calibre can do the latter
so the OP can probably get close via a calibre epub to epub conversion that also removes stuff as ticked in css options and appends extra important css also. the Line heights may be trickiest unless a standard !important override to a preferred value is used
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