Personally, I would be staggered if the painters took the time & trouble to mirror the finish.
After all, they were supposed to be for identification purposes, and it's not as if there was another Felixstowe with a similar curly white on red finish to confuse it with! It would surely have been quicker, easier and altogether more expedient to carry on the general them on the other side of the aeroplane. There was a war on after all! It would look a bit too artificial to my eye when on a completed model, especially a bloody huge one like the Felixstowe. Just would look to perfect, too "modelly".
Having said that, I will certainly buy whatever Rowan comes up with.