It's great that you guys are wanting to do more fun things with your cars.
I would say just stick with autocrossing the X3 in clubs that are less strict on the roll-over policies. There should be multiple clubs/ogranizations in your area, other than just BMW or SCCA (PCA, for example).
In case you quickly lose interest, and for your first year, I strongly recommend you just race what you have rather than modding or getting a dedicated car for it. You'll learn just as much for less money and less risk.
Once you get a lot more seat time and better feel for the sport, you will start seeing what cars are good for all-around track/ax duty and what kind of mods are needed to be competitive. Until you get to this point, I say just save your money on just seat time and tires. Unless you have loads of money and/or like to re-do things, take my advice.
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