Is there any chance of forgetting about 'circling approaches' here as the original question did not involve those, and they are really only serving to confuse?
I assume Hetfield asks about LATE changes to landing runway, which I have experienced (and either accepted or declined) at several airfields in my time. The USA IFR clearance ILS 07R with sidestep to 07L would be easier to solve as there would be time to look at any G/A for 07L. With the later change I have always assumed my G/A would be straight ahead and then into the circuit unless there is an ATC specified alternative. since I am flying a purely visual manoeuvre.
It is MOST UNWISE and very poor airmanship to go head down and start pushing FMC buttons for a runway change at a late stage and I have seen command and line checks failed for that.