Two similar new ideas:
Karting Festival, where each night features a track which has normal and Karting layouts. Start in the small Kart on the Kart layout and switch up for each race to finish on the full circuit in the Superkart.
Similar thing with Oval cars, using the Road courses and Oval of the same location, but staying with the same car throughout.
For Practice we could use two servers, and you jump between them. Come Race time, make Qual 10 min so you can get back in sync with that races car/setup.
Oval setups should not be a problem as we have a reliable and much appreciated source for these.