Can't really help you with suggestions but understand the situation. I'd feel a bit awkward driving a sports car while her dad is stumping up some money towards the wedding and I appreciate you want to make a sacrifice.
Just understand this is a motors forum and not everyone is going to agree that you'd rather get married and have some money to spend on enjoying things together than drive a sports car to and from work everyday.
I used to be car mad (I still am in my head) , but there comes a time when there are things a lot more important than driving a sports car. I've got a wedding to pay for this year aswell so I feel your pain!