I've been pushing for a total team effort in the Schumacher Taxi Service, where 8-10 drivers all get to run two different cars. The idea would be, ideally, each person would get two longish stints, one in each car. Sounds good on paper, but only if all drivers have an interest in driving the "other" car.
So far it hasn't taken root, probably because pockets of us have significant wrench time in one car or the other and prefer that car. We do already have a sort of unspoken agreement that if a car dies before all drivers get a stint, the other team(s) offer up short stints to at least get those drivers on track. That has worked out well and fostered a lot of goodwill amongst us.
If you can pull off your plan I think it's full of win. I will caution that the likelihood of one car or the other having issues is extremely high, which might take both cars out of contention for a high finish due to increased driver changes. Just another consideration.
Jer / Schumacher Taxi Service
2010 Spring CMP I.O.E. winner
2010 Sebring overall winner
1996 Miata, 1991 BMW E30, 1987 coROLLa (retired), 1984 Citation (retired), 1993 Miata (retired)