Somebody has to ask so it will be me. Why? Why do you need fast idle when the engine is warm? I am with Kowalski. A a/c solenoid hooked up to a toggle switch would do the trick. Not adjustable though. Hook a cable up to the fast idle cam.
Right. Either its not quite warmed and a bit of choke won't hurt and will keep it on the high idle step (like TJ's Chevy), or it is warmed up.
Earlier manual chokes often had a manual throttle too as a seperate control.