Holding a shower like this could end up feeling like more of a fundraiser than a celebration!
Don't forget, the new mom probably isn't even in on the planning, and might really ENJOY unwrapping pretty packages! I say wrap up your gift just the way you were going to, and if anyone asks (which I dont' think would happen), say "I thought "so-and-so" might enjoy actually unwrapping a few items, so I couldn't resist!"

Sounds like one of those ideas that most people aren't going to follow, anyways...