However I wondered whether this would be appreciated or considered overcomplicating a situation so decided to just do the expected/predictable thing
Are there any rules r.e. using a passing space on the "opposite" side of the road? Is there even an "opposite side" of the road on a single track road? Is "keep left" a thing on single track roads?
A bit different, but I was once passing a load of vehicles parked on the opposite side of the road when an ambulance wanted to come through, so instead of creating a slalom for the driver I drove onto the opposite side and parked in among the cars, to enable him to just drive in a straight line...I was a new and inexperienced driver at the time but it just seemed the logical thing to do...the driver seemed appreciative