Well, there's only four methods of heat transfer, and you just eliminated one (advection). The most interesting one that remains is convection. (There's conduction to the heat sink too, but that's always there with a heat sink. There's also phase change cooling, but that's within the heat sink.)
Basically, you want to:
1. Find a big heat sink.
2. Mount it so air can flow upwards through the heat sink. I assume your case is also fanless; otherwise why bother?
Typically, go for a large internal CPU cooler like the Nofan CR-95C for 65W+ TDPs (and a mandatory mesh-laden case) or a heat sink case for less powerful processors.
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