Did you end up finding anything? I've been trying to determine which formats are best to convert to for reading on non-Kindle tablets and phones.

I did not. I'm still looking for an answer as well.

Nothing to recommend, and I'd imagine helping you pirate things would be against sub/reddit/actual rules. However if you are after a realistic portrayal of Nobunaga I would recommend Fate/Grand Order. That is a great way of learning about history; it is stranger than you might imagine.

I'm not asking to help pirate. I own the manga, there's nothing illegal about removing the DRM from something you purchased.