for the reference thread we created epub but still facing view in iPad, created epub is able to open in other reader except iPad, We tried with additional xml file integrating into META-INF, still zero result.
and unicode conversion barely happening for tagging in Sigil or Notepad++, as Embedded font in pdf's are old one (i guess and not sure).
I've attached the sample pdf. The converted epub open in ipad or kindle(except kf hd or kf8).
Happy New year