Hi, not sure if you would be interested, but I have a OP 7T device available for testing. I flashed /e/ using the manual method (quite a while back actually…), but I can walk you through flashing back the stock ROM and then installing /e/.
As a side note, it looks like 7T will soon get an upgrade to Android S (12), so you might want to wait for that (I think the upgrade will not be possible as OTA so means you will need to upgrade manualy again). No ETA though…: