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Wanted to post a follow up for posterity.
According to a local IA, you cannot de-rate, however, you don't have to fly with the pressurization working. In other words, you can decline to fix issues with the pressurization system, as long as the IA believes it doesn't pose a threat to safety or proper operation (beyond pressurization itself).
Alas, those issues are, according the same source, but a fraction of the costs associated with 'P' models. The obstruction of the additional systems accounts for much of the additional costs. The extra boost of the 225 turbo, unless faithfully reigned in by a determined pilot, burns up components a little more quickly than the 210 turbos, and much faster than the NAs. This, not from my own experience.
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