Should we pay 165k for an existing library update when all other libraries were provided for free, including the .NET one I built?

The answer is obviously no because, based on my own experience:

• it doesn't require a year to do it.
• adding a few operation support to an existing working solution isn't a big deal.
• if it's ever taken you "hundreds of hours to do most of the scaffolding for Hive Jump", I'm worried about the delivery time of this "much needed" library. Not to mention the debugging and maintenance required afterward.

I will add that the way you introduce your proposal, and the way you reply to critics in comments and questions, are all but professional.

I advise you to follow the "deliver first and then ask fair compensation for your work" path.