What rules/features could be used in a rookie series?

We are a german speaking community with our 4th duo-cup season on the way and we were thinking about separating the Rookies from the faster drivers.

Our goal with this change is:

  1. Less unpredictable cars on the track for people who take simracing a bit more serious
  2. Rookies get a chance to actually win and compete without constantly being dead-last

Do harsher penalties for collisions help rookies to compete safely, or does it make it even more difficult for them? I was also searching for options to disable damage, but apparently ACC doesnt offer that.

Are there maybe other rules/features that could make races for rookies more interesting?