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A lot of this is untrue. Many Cadence PDKs use industry standard models and there is no difference between  Berkeley BSIMSOI for SPICEs and Cadence Spectre's in the params.

Now the way modern PDKs are built, you may have to get through some layers of abstraction to get a directly digestible SPICE model for commercial PCB oriented SPICEs. It's doable and it is tedious, far from impossible. Good idea, or not, if it's all you've got then may as well get going.