I think removing the accelerometer module might do the trick - it’s behind the console somewhere. If it can't detect lateral G then it can't apply any correction.

The 'off' position only affects the torque limiting part of the system, the system will still cut in under braking to distribute the braking force across the four wheels. With the system off you can actually power slide in the wet by applying excess power smoothly (the dash light still flashes, but the throttle doesn't get backed off as it does with the system switched on) In the dry there is so much grip that just lifting slightly after 'a bit of a moment' usually restores grip pretty much immediately after a couple of 'tail wags' without the system cutting in anyway. There's no mistaking the system when it cuts in. If you deliberately (or otherwise!) get a 'tank slapper' going at 80+ you feel each individual wheel tugging as the brakes are applied to each wheel.