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The name Oxygen OS is a misnomer. It's not an operating system, it's just the branded, customized version of Android for OnePlus phones.
https://en.wikipedia.org/wiki/OxygenOS
OnePlus seem to be paying for most of the development.. So unless someone decides to do some sort of deal it seems unlikely.... As there doesn't seem to be a huge advantage in this over aosp or cyanogen (cyanogen mod, not cyanogen OS)
There's also a domestic version for China called Hydrogen OS, based on Android.
There's also a domestic version for China called Hydrogen OS, based on Android.

You mean "All Seeing Eye Of Mordor!" China Android version![]()
@mikedt I've read a great deal of your post and from my intuition and analogy, you seem to have a remarkable availability on gathering important information about any Android technical subjects that's placed before you.
Is there a possibility if you hadn't already done it? Open an account at OnePlus community and find out some pacific's on their Android device modifications development and share your findings with Android Forums,? I myself has opened an account with OnePlus community to see what I can gather about Oxygen ROM because there is no written information on what that ROM actually does and the Improvement s on which it contains.
Frankly there's nothing special or magical about their Oxygen OS or Hydrogen OS, it's just another version of Android from China. Many Chinese manufacturers do it, have their own branding and ideas about how Android should be. Like Oppo with Color OS, Vivo with Funtouch OS, and apparently OnePlus phones are made in Oppo's factory. And OnePlus was founded by ex-Oppo people. There's even been evidence and much debate if OnePlus is really just a subsidiary of Oppo. Both Oppo and Vivo are actually the same company, BBK Electronics of Guangzhou. The OnePlus One was basically an Oppo Find 7a, minus some features, like rapid charging and NFC. 
Isn't this just a name for their customization of Android that they're running?
OnePlus = Oxygen/Hydrogen
Samsung = TouchWiz
HTC = Sense
LG = Motion
ASUS = Zen
Xiaomi = MIUI
Etc.