I think a good heat pipe or vapor chamber cooler would do it, at least for normal operation and the exchange happening outside of any size box, should be a lot better than just a hunk of ALU
Mind you in PC, before heat pipe ASO kicked off there was also a few massive copper CPU coolers, Zalman had their huge Zalman CNPS7000C, a chunk of copper i later managed to mod onto a GFX card
Became so heavy that i had to make a GFX support bracket, something that only " now " are seeing its way into GFX cards with huge fat triple slot / triple fan GFX cards, i guess i was a decade or 2 ahead of the curve.