Oracle APEX: Reset session on every application launch?

My use case is actually from the standpoint of an Oracle APEX developer. I'm on version 18.2.

I am working on a single-page application. Every time I run my APEX application from Page Designer, I want the session state of my application to essentially reset. Item values should all start out as NULL, or at their defaults.

I've been playing with a Dynamic Action on Page Load, but that's overkill: if I'm testing multi-step series of operations, simulating an end user, across those actions I want session state retained. But every time I make development changes in Page Designer and then click the "Run" button to launch my application, I want a clean slate.

Is it possible? How do I go about it?

Thanks.