I have to agree with AidaLuthien.
Harry would do everything possible to make sure that this did not happen.
We don’t know what is on the coins anyway, do we? Does the obverse carry the Queen’s head (like all UK coins)? And what is normally on the reverse?
Whatever the case, in the UK I can (off the top of my head) think of very few coins (even commemorative coins) with people’s heads on the reverse. Charles and Di got one and it’s likely that William and Kate will, too. But apart from the royals, I can only remember three people getting their head on a coin, and they are all dead and national icons: Winston Churchill, Isambard Kingdom Brunel, and Charles Darwin.
Frankly, it doesn’t strike me as being very “British.”
That’s all very negative, sorry.