Nice one Mel but I don't think that little pot is actualy handling the energy required to engage and disengage the clutch mearly driving a servo of some kind which could be electric or hydraulic. In any event the use of a clutch in a single seat racing car is very different from that of a normal vehicle.
They are operated like a switch when I drove a formula ford some years ago I was told 2500 revs and just let it out no slipping just one smooth quick release or it's bye bye clutch.

2500, drop the clutch at 6000rpm then its straight to 10500 on my s/seater

But hand lever and maybe a servo wouldnt be hard to set up, and would be the cheapest way to go.