ROUSH Mustang GT install

Hi From England..
Running an MG ZT 260 which is a low volume variant of the Rover 75, its fitted with the 99-2004 4.6L 2v mustang engine.

I have a question regarding the charger from the Roush stage 3 set up, I can obtain the charger and manifold, but the ( commplicated) drive set up from the stage 3 kit is no longer available.

I had thought to shorten the blower nose, and buy an 8 rib upgrade pulley system, and use a 1 belt drive set up, but have been told the nose will not shorten by enough and still leave room for the bearings.

can you obtain a 6 rib accessory drive crank pulley that an 8 rib charger drive pulley can be bolted onto- if this is obtainable then the install of a 2 belt system will be feasible, I can fabricate idler pulley mounts etc no problem.

any good ideas ??