PayPal Express does not provide enough functinoality unfortunately. It would be easy for PayPal to implement a default "Checkout as guest" feature on PayPal standard, but it seems like they are restricting this element of the service in order to "encourage" users onto PayPal Pro. Incidentally, I received further communication from PayPal regarding the possible reasons why the guest checkout was not available. "2) There could have reached the maximum number of times they can checkout as guest with that card, usually after 10 times PayPal requires you open an account." I probably processed more than 10 test transactions using my card, so this is probably the reason why the guest checkout was not available. I contacted PayPal directly, and they have restored my account to regular standing.
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