I have never heard of paired TTs

Perhaps there is a race designed like this, but I doubt it would be called a TT

The TT is about individual performance, individual power output and individual endurance.

The one exception of course is the team TT - but I have not heard of m/f pairs in a TT...

I do think your idea is an interesting concept and I would be interested to know if anyone out there has heard of such a race... I might suggest it for one of our end of year "fun" events for the club to trial...