I live really close to Summit Racing, and have had some luck talking to their sales guys in the past. At one point, I upgraded a Ford alternator from a 135 amp to a 290 amp (IIRC) via a local generator shop, which failed to tell me the $350 alt upgrade would no longer charge at idle.... rendering it useless for a daily driver. I called Summit, and while they had nothing on the shelf that could help, they gave me the number for one of their performance under drive pulley suppliers (i.e. company that makes the serpentine set up to spin alt, water pump, etc. slower to free up HP) and they were able to offer a one-off custom-cut pulley to get my upgraded alt. spinning roughly 200 rpm faster at idle, which allowed it to work correctly in a daily driver. So calling Summit and doing some leg work got the part that literally no one sold as a mass produced item.
If you are dead-set on Bilstein and they don't offer a performance strut regularly, they might be able to offer something from another model that might fit with a little work. Or Summit might be able to put you in touch with another higher-end strut manufacturer that can do the same thing.
FWIW, lowering the car with great springs and adding stiffer bars, plus a strut tower brace (front/back) and cheap stock struts can make most any carve hard, especially if you can get the car on a diet.