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What all is run by the body control module?
In most Hondas of slightly newer vintage than mine, there's the ECU, and then a multiplexer which is the hub for most of the chassis electronics. Generally speaking, aftermarket ECUs support communication with the Honda multiplexer. I'd be shocked if there weren't something similar or equivalent for General Motors.
That said, for simplicity, it's usually preferable to either flash the (Honda)'s stock ECU, or to use an ECU from a very similar vehicle. E.g. the ECU from an Acura RSX is typically used in Accords, Civics and other vehicles from the era, because it can handle all of the same sensor and chassis communications, and has the most tuning options available to it. This sounds like it could be similar to the Cavalier setup you've mentioned.
Sorry I can't be of any more specific help. I might suggest that, if you use Facebook, send a join request to the Guild of EFI Tuners. They're generally a pretty good lot, and very helpful.
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