There are good reasons behind the racers going down the Brooklands screen or hard top route.
I very rarely used 5th on my 4/4 Sport it was far too tall for the Sigma / aerodynamics of the car.
My Plus 8 could easily pull at least another gear so a six would do but I don’t find it necessary the torque is incredible unlike the revvy engines.
The 23 on a good day to the gallon is a small price to pay for the sheer enjoyment of the soundtrack and smell of hot metal and warm leather let alone the countryside.
I think the last thing you need is an extra gear - maybe an Audi 😂