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> But I don't see any models with Iris and a dGPU

I don't remember exactly what the chip options were back then, but currently Intel enforces that by ensuring that the laptop chip with the larger iGPU doesn't actually have enough PCIe lanes to connect a dGPU.

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But you could use an external GPU on any of the up to four Thunderbolt 3 ports. Intel is stingy with PCIe lanes but there's definitely enough. A dGPU doesn't need the full 16 and will do just fine with 8, maybe even 4. Especially the low power ones found in laptops.

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