Oddball car - swap to disc - ideas?

Remember in most cases rear brakes are called on to do just 15 to 25 %of the braking.

Yup...been riding street bikes for 33 years, give or take. Have had several sport bikes that I had the rear rotor get such a glaze on from not using it that the rear brake didn't work. Always thought that rear drums on a car with front discs were just there so you had a pedal...