So I've been searching for information on the control chip (ASM1064) for this adapter, and it comes recommended by Unraid so long as it has no more than 4 ports attached: Recommended controllers for UnraidMy question is whether an expansion card like this would work in one of the NVMe slots:
M.2 NVMe to Mini SAS 36 Pin SFF-8087 SATA 3.0 Expansion Card M.2 Key-m Key-b | eBay
It should do ~900MB/s Sata/SAS controllers tested (real world max throughput during parity check)
From my very limited understanding the motherboard will see the four connected drives via one single controller meaning bifurcation should not be needed.
I think I'll give it a go unless anyone can offer contrary advice
------ Edit: I think I've answered my own question
The review says this QNAP DAS + PCIe controller combo was compatible
The controller on that card is an ASM1164 and the controller on the NVMe adapter is a ASM1064
Might be cheaper to find a PCIe adapter. I will keep hunting
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