Just speak to the dealer and explain you’re aware of the issues as doubtless are they, agree that the 03S are definitely useless (pretty sure they’d be swapped on sight actually without a leak test, different matter for the 04S) and agree that if it’s the 03S or a leaky 04S that you can have priority access to the workshop for replacement. If the dealer is even half decent they should be able to accommodate it.
There’s a lot of talk of rejections (and some that have) but that only really leaves you with the used market or a different vehicle entirely. Think long and hard before such severe action especially now the order books are looking to close very soon - trying to re-order might be difficult or even impossible.