Richard...
I think some have more than enough ballast to compensate
As for the roll bars... I agree Craig, that's tough at late notice. I know that many Cobra's have a 'false' rear stay on the roll hoop and that's not an easy fix.
Looking at last years list, I recall that most people in the zone have the right gear.
End of the day, if it makes this safer all round, then you can't complain.
Cameron