Coiners routes would work nicely as would lots of venues and the idea would be great but as has been said by readers of the thread it wont work because of numbers, a handful of clubs could muster a team with a runner from each category. It would be ahuge amount of work for very little return and frankly I cant afford the time.
The principle should be used for a fun event such as the FRA Presentation do as per the discussions for next years do where runners from age groups can be picked from a hat to make up teams. Lets see how it goes there.