If you have some time to spare and your oneplus one is not your day-to-day phone, you could give porting pmOS to it a try: https://github.com/postmarketOS/pmbootstrap/wiki/Porting-to-...

All you need is some Linux knowledge, and we will help you with the process in the irc/matrix channel.

Even if you can't get very far, it helps the next guy who picks up your work and starts from there. That's why we document our progress on a device-specific wiki page:

https://github.com/postmarketOS/pmbootstrap/wiki/Devices