Many couples elope and then have a wedding reception or party on their return. A wishing well is generally used for wedding cards with money enclosed. Because some people don't understand what a Wishing Well is then you may have to put very delicately in your invitation what a Wishing Well means. You could also let people know you are registered at different stores under Wedding Registry and they could buy your gift at one of these stores.
I'm from the UK, I've never heard of a Wishing Well at a wedding.
