It might be a turn off to ship your coffee with instructions on how to cut the top off a 2.0 K-cup. But if your K-cups just needed an "adapter"[1] then many consumers would probably not think twice about it. We use adapters all the time to make one thing work with another.

[1] https://www.gourmet-coffee.com/Keurig-DRM-Freedom-Clip.html