Careful with the demo workspace - if it's too good, people look at the fake data, nod, and leave, and now you have a metric that says they engaged. I'd rather make the connect step take 90 seconds than build a parallel product.
Concretely: put the exact click path on screen with screenshots of the other service's UI, deep-link straight to their key page rather than their homepage, and let people paste the key on the screen they're already on instead of sending them to settings.