I am bracing myself already against the endless assumption that what I have is a Morgan. To that end I have started planning the subtle bling that can be pointed to when the question arises...
Here we see a stainless steel sliding door pull, holed and epoxied to the end of a racing bike handlebar to accept a bar end plug with the BSA piled arms logo on it.
When the bar end plug is removed, I could put a small Jackstaff in the hole for a pennant that reads, no, it's not supposed to be a Morgan, or alternatively, A CKGB flag or banner. I have contemplated a red ensign also as I used to have one on the back of the tandem.
... All good fun.