No tune/71.
7:33.838
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I got an idea for Your consideration:
Some of the longer tracks do not have a reverse layout. Sierra doesn't even though it's a made up layout.
And there's seldom a time limited challenge. These could perhaps be combined. So take Arcade Time Trial with Circuito de la Sierra or one of the set of long Nürburgring, and turn the car around before the start line. The time limit should be low enough that you can't reach the end with the given car - indicating more than 1 lap would need a video - so perhaps six or seven minutes with Sierra and a sports car. From replay, take the external view and shoot at the given timestamp. Lap timer should be at zero.
Since user made tracks are out, it should be simple to see who got the furthest, and the track map could set apart the ones who aren't really close. Just don't set the AU land speed record boat or the Tank Car as vehicle.
You would restart for each attempt, that is a downside. The game won't give us actual numbers like distance, so the results would be sparse.
Does this seem worth a go?
N.B. I have submitted another batch of events to the organizer
@bjl23 , so if somebody makes something out of this, it's likely not me.