As it stands, Hill is without a drive for the Great Race, though Whincup is keen to change that.
“We're helping Cam out, trying to get him on the grid for the big race and also thereon,” Whincup told Speedcafe.com.
“It's not just this year. If Cam can get a gig, who knows where for next year, we'll certainly be working hard to help him out there as well.”
Harri Jones had his second hit-out with the team having earlier in the year joined them for a ride day following the championship season-opener at Sydney Motorsport Park.
Another youngster, Tyler Everingham, also cut laps with the southeast Queensland-based team.
PremiAir Racing isn't the only team with co-driver openings.
All other seats, besides wildcard entries, have been filled.
Asked whether there was scope for Fraser or Hill to step up in an expanded main game effort in 2023, the team boss ruled growing the stable.
“The three-car model is difficult to make work,” said Whincup.
“You're either two or four. No, we're comfortable running two main series cars. That's certainly our plan for next year moving forward.”