It's a team championship rather than a drivers championship. As long as the stand-ins are temporary (i.e. Bawbag substituted for Charles a couple of times, but is clearly not the main driver).
*Looks at LFSW profile for Dave*
Yeah, looks okay. Not an alien, not a noob. I trust you. Points are more important than outright results, so don't get too carried away trying to close a 20 second gap in 5 laps.
I'll PM you a link to a T7R skin if you want to fit in (will look better in replays as you are a temporary T7R driver), and if you like I might have a setup or two I could throw your way, but that's going to be until about 45 minutes before the event (i.e. 6:15, qually starts at 7)