Sounds like giving it up to me. If it's not during the Runoffs event, they have given it up.
Your part of how they will make more money is key. This is a large departure from the normal Runoffs format, and a sound, realistic, and well funded proposal is key as I see it. If it's still their event, it's more expense for SCCA as they will need a carbon copy of Runoffs stewards, tech, etc. More $$$.
Just my 2 cents and I wish you luck. Sounds like an interesting concept to me.