Do you think we can get away with it?

I don't think it matters. You and hubby will be known as Mum and Dad, so no A's. The twins are twins so have been given 2 A's for that reason. Go with whatever you want. We had names lined up for our twins but when they were born we saw them and gave them names we hadn't even thought of up until then. This is something you really don't need to be flapping about. When the baby is born, go with what feels right at the time. Good luck, you're going to be busy!!! x