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If you call their UK office, they can send you out the cockpit you think you'll need in advance, creating an account for you with a debit on it. Then once you get the bike, remove and ship back the cockpit you don't want, and the debit on your account is cancelled.
I swapped the cockpit on my Aeroad 3 times like this (indecisive, and then had a bike fit). It's relatively expensive to ship back to Germany with tracking and insurance, sadly.
Ultimately just having a normal stem and bars is better in terms of being able to cheaply change your fit, but I'm vein and the bike has Di2 so I wanted the Aerocockpit with the recess for the junction box!
Same what happened to me ive ordered the bike and weeks later ive ask them that the bar is to near for me and they offer me to change the bar all you need is to pay the shipment going back to germany or post it to uk canyon address