I can see no obstacles to what you propose other than emotive ones.
However, taking your 4) (Airblue Islamabad) - with the technology that would permit an 'automatic' CTL, surely it would be more logical to simply produce an 'automatic' approach to R12? The only time a CTL would then be required would be in the event of a very late runway change since there would otherwise be no need for an approach at all on R30.