Not the answer but one of my favourite things ever in football was when Paulo Sergio scored for Bayern, whipped off his top to give to a disabled fan but had another shirt on underneath. Think it was pre-bookings but I'd be interested to see what would happen if you did that now.
The booking is only because the sponsor isn't being shown, so if there was another shirt on underneath then you're golden.
Holy shit, is that really the reason?
If that's the case I'm surprised we've not seen crudely made Sharpie vests like:
Wonga
GOD HELPS ME SCORE GOALS