Here's a thought that would take some trust among 5 drivers and not need a rental or unknown car:
Run a series over 5 events where you alternate your car as a donor for 4 competitors to drive. The owner of the donor would sit out that week but still, hopefully, co-drive or use another car for the regular season event. It would only be for one event each person.
5 events would give each driver 4 events in a car other then their own.
I would expect we'd have to have a minimum standard of experience and mutual trust in the group. I don't think that's a long shot.
To meet the rules for insurance concerns they can be classed in two groups but for the competition we'd only use raw times.
Note: I had a good night sleep so I'm ready for your reply and/or rebuttal, Brain.
Be gentle
