Over at the UK/Ireland Facebook group, a discussion about how Tetran Cowall interacts with the Stay on Target EPT has been happening.
Here is Alex Davy's (FFG designer) answer:
"If Tetran Cowall is equipped with the Stay On Target Upgrade card and reveals a [k-turn] maneuver, he may first treat the speed of that maneuver as "1," "3," or "5", then use Stay on Target rotate his dial to another maneuver of that chosen speed. He may also reveal a maneuver, use Stay On Target to rotate his dial to a [k-turn] maneuver, then treat the speed of that maneuver as "1," "3," or "5."
Tetran Cowall is now awesome.