On the 4/4 the steering effort never was a problem. I was forced to do the conversion to make room for the bigger calipers. After the steering bearing conversion, the steering almost became too light. I never liked the cam and peg steering and when I traded in the 4/4 for a brand new +4 in 2008, the rack and pinion steering was the greatest improvement apart from the 2.0 Duratec compared to a 1.6 Kent.
Your roadster should have roller bearings as standard. Otherwise,
if you go for the steering bearing conversion, it is best to wait and do it when you replace kingpins. You will also have to change to shorter main springs to allow for the bearings.
Harald
