You really don’t need to get so technical about it. You don’t want to alter your roll centers? If you lower your car, you’ve got no choice. The front roll center will be lowered by more than the center of gravity, maybe a lot more.
As long as your roll center remains above ground level and isn’t higher than standard, you won’t go too far wrong. You can guarantee this by ensuring that the angle of your control arms is somewhere between stock and horizontal (not sloping up to the hubs).
Keeping to this rule of thumb (either by not lowering too much or by fitting a roll center correction kit) might not give the optimal result but it’s better than ignoring roll center altogether when lowering your car.
Just noticed you're an experienced racer so apologies if I'm teaching granny how to suck eggs 🙂