To my mind there are two things wrong with the Vectrix: 1. The brake levers are on the wrong sides and need swapping over. 2 the seat forces a cramped uncomfortable posture on the bike.
So, this morning I performed 'surgery' on the seat and removed the pad fitted to the rear seat. It is not easy to do, but possible.
Here is the 'seat bum-pad' removed and shown inverted. 4 large holes to sort and foam to remove too:
Trimmed and plucked:
Here I've stuck on a temporary patch (intend to recover the whole rear seat) :
Those few inches are going to make a BIG difference