Official TWRP 22.214.171.124 has just been released for the OnePlus 2. Should work on all variants.
Note: you install at your own risk. Do not try to install this on any other devices.
I have worked with Dees_Troy to get a build out for the OnePlus 2. Download available here: https://twrp.me/devices/oneplustwo.html
Please test and let us know if there are any issues. Should work with all three devices. I currently have a2001 64gb.
Current version of TWRP will flash OTA's. I have tested this.