You might want to use the opportunity to push for a fishery policies reform which is overdue anyway, and if you ask nicely we’ll introduce national backsides for euro notes so that you can have Charles’ mug on them. The Euro is going to stay decimal, though.

Basically: Do it, but restrict yourself to things that already have some decent amount of support, or are quaint, of incomprehensible cultural importance. We’d get suspicious if you don’t.