Preparing colonies for independence through institutions

How could Britain use foreknowledge of each colony's independence date to accelerate the Commonwealth and preserve good relations?

Start early: develop trusted courts and elections, train local administrators and teachers, and retain prestigious educational and professional ties after independence.

In this counterfactual, knowing each independence date gives Britain a timetable for preparing local institutions. Trusted juries, competitive local elections, and enough trained civil servants and teachers would need to exist before sovereignty passed. Higher education and advanced military or police training in Britain could continue as prestigious professional links after independence. The proposed Commonwealth relationship rests on local administrative capacity and continuing training ties.