I was thinking of this route as well. My problem is with an HBA, Quadro Card and NVMe, I'm tapped out on PICe lanes.

Might have to make a sacrifice and remove the NVMe drive and get an external SAS.

Could you recommend a JBOD that can be daisy-chained and won't be too noisy or expensive? I looked at the NetApp-DS4243 devices on Ebay, but it seems that they are all missing several components that I need. And the trays are EXPENSIVE!