So today I decided on another go at this. Charlie is ■■■■ well going to do things my way or take the highway. After a bit of talking, Charlie and I finally agreed to a new flight plan - KL International Airport to Singapore Changi Aiport. Not too much of a hop, and something I felt hopeful my ever-unreliable A.I. pilot might just be able to manage.
Things began well. I think that was due mostly to the planning. From a parked position, out onto the departure runway, up, up, and away (I chose the high-altitude route - we were in the A20 Neo) and Charlie was properly (if a little ostentatiously at times) following all the waypoints and - crucially - maintaining correct altitude and engine power at all times. I was completely ‘hands-off’ with the flight controls. Gotta trust Charlie, right…? 
Against the odds (and perhaps thanks to two weeks of enforced sobriety on his part), Charlie actually made the landing at Changi - and, as if to rub it in, he taxied the plane all the way (and it was a long way) to its assigned parking space. All without incident. I mean, even the landing was flawless (on target and with no casualties amongst the passengers).
Things might be looking up. Charlie’s full of himself now, grinning like a loon, continually muttering ‘I’ve still got it, mate.’ Perhaps. He looks thirsty.