new roll cage ideas, in light of Helmet to metal 2" rule

The new rule on the spacing from the drivers helmet to the roll cage, or the outer plane of the cage (broomstick rule), is going to cause problems for many race teams with existing cages fit inside the car.  Some of that discussion has been happening here:
http://forums.24hoursoflemons.com/viewt … 897#p78897

I spent last night looking at the HondAcura (Civic Dx hatchback) trying to figure out how to solve the problem. We have already dropped the new Evo XL seat a couple inches to accommodate two taller drivers for the March race, and we have 2" to the outer plane, but we are no where near to having 2" of space to the upper left roll bar. To solve that problem I think we are flattening the tunnel and moving the seat toward the center of the car. Its going to be hard enough for the shorter drivers to see over the steering wheel, I think we are also making seat inserts for everyone but the big guy.

As part of that solution, I spent some time and discussion with a couple team mates and came up with some ideas for a new roll cage, if we decide to go down that path. Or we might just junk this car and get a new car and put the "new" cage in that one.

Idea #A. has already been posted here:
http://forums.24hoursoflemons.com/viewtopic.php?id=8419
Its a upward bent ridge bar to allow for more vertical room under the cage. This doesn't solve the spacing to the left side halo bar, but its one idea.

Idea #B. Make the Halo hoop wider and have it be outside the window. This would probably require cutting the upper window frame. This might also require cutting of the B-pillar, and so that might violate the un-modified structure rule.

Idea #C Roof Rack> drill holes in the roof for the 6 upright and put the upper halo on the OUTSIDE of the car. This make the upper halo now a roof rack. This also give you a nice handle to grab onto for exiting the car. It also makes building the cage a lot easier, all of the welding can be done with good access to all joints. The helmet to metal clearance now becomes 2" to the cars original roof structure, not the roll bars and so there is much more room to mount the seat at a normal height, which will allow people to actually see out of there cars.

Idea#D  Well if your putting the roll cage on the roof, why have a roof? All cars are now convertibles/roadsters? Just cut the dam roof off? You'll need to tie the front body and rear body sections into the roll cage to have a stiff car, and this again might violate the "no structural modifications" rule, but it seems like the easy answer, you build a tall cage to allow your drivers to have good sight lines depending on the car.