The mixed relays is just a lead in to accept transgender participation and eventually elimination of womens sports. So Im a NO. Just exactly, what is the percentage of people that want this anyway? My guess is its pretty small and being pushed out by very few as always when it comes to radicalism and liberalism for acceptance of others that want to force their beliefs on the vast majority.
You want something new and interesting to a traditional schedule, throw out an 800 or 1600 medley and let them hammer on each other.
Make field event relays totaling your 3 entries distances or heights. It's not a new concept but doesnt add more time to the schedule and encourages team environment. Id rather see/pay for that than repacharge meaningless races.