Aside from the Opel full 6 switch assembly #39111155, which for me is cost prohibitive just because of shipping from across the ocean, there's GM #39137617 GS 4-switch option that can still be bought new for <$50. That's what i'm considering, though it's only my assumption that those switches could easily be wired to whatever accessory you'd want. I haven't seen a US version that has more than those 4 switches, unless #84576852 for the Envision fits - that's got 5 switches in it & <$50.
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Also, i don't even know if ours have a harness under that fake switch assembly at all, so might need to get a harness as well.