When it comes to expressing the idea of "in any case," there are several synonyms available. For example, "regardless" is a great option that suggests an action or decision is independent of other factors. "Either way" is another good choice, implying that no matter what happens, there will be a result that will still hold. If you desire more expressiveness, you can try "in any event," which signals that whichever way things go, there will still be a plan in place. "At any rate" is another synonym that emphasizes the importance of a given outcome and implies that regardless of what happens, there are essential facts that need addressing.