Omni has now been ported to the Oppo N1 Android phone. Make sure you do a backup of everything important you have on your phone because after installing it, data will be lost. You also need to have TWRP on your phone.
Download it from here. Since there are no pre installed Google Apps, you should separately install them from here (no big deal if you do not need it).
You will have to flash it using TWRP – stock recovery would not work if you want to install custom ROMs. To do that, download the file and put it on your SD card. Get into recovery and select the file in TWRP and flash it.