As far as combining them yeah just adjust the tab attributes and code accordingly. My guidance would be to create a new dashboard and then copy the decluttering and nhl tabs over to the new dashboard. Clean up and then add F1 piecemeal. That way you don’t mess up your original card and only add the items you want.
Haven’t looked at F1 but a couple items: there is a chat about the F1 Card over at Formula One Card
and @newneo discusses it on this link:
Looking forward to seeing what you create.