Lengthen endurance race time, Reduce endurance practice.

[Scored51]

... use your own bikes and just pass off the transponder.

I say the stipulation with the transponder is it needs to have the clip safety wired at each rider change. Cut the wire, pull the pin, move it to the new bike, and safety wire the pin closed. This puts some pit stop skills back into the mix without a huge amount of effort and equipment.