There have been 3rd party ECUs for decades, "piggyback" fuel and spark controllers which take over functionality of the main ecu, devices to disable rev/speed l

There have been 3rd party ECUs for decades, "piggyback" fuel and spark controllers which take over functionality of the main ecu, devices to disable rev/speed limiters, custom transmission controllers, and so on. I wouldn't discount the aftermarket's ability to develop something that fulfills owners' needs. (Post-warranty)