What can't you get to work - opening a PDF document in Word, editing the document in Word, or converting the Word document to ePUB.
Here's how to do the first one ==>>
Opening PDFs in Word - Word
If you can get it into Word and save it as a DOCX you can then get calibre to convert the DOCX to ePUB. And from there to whatever your kobo wants - I think they need kepubs which I assume is the proprietary form of ePub that works on Kobo devices.
Don't expect a perfect result, and it could be worse than KOreader on your kobo.
BR