I could very well be making uninformed decisions. I’ve read a bunch of your threads and appreciate the testing you’ve done - if you have collected a list of suitable cards, please share. I’m getting slightly frustrated with my lack of knowledge 
I read this thread and the " DiLinker LRNV9349-8I"adapter is the same as from other “brands” - shinreal, linkreal, lr-link and most likely a bunch more. All listed as using a Broadcom PEX8749, which should just do pcie switching? I’m not sure if they would do firmware changes that could trip me up. Their sites look exactly the same too, except different company addresses.
On top of that, Linkreal lists a card (can’t find the product but its in the sliding banner thing on their front page) that seems to be exactly the same as this one from Delock. Feels like a mix of crazy pills or the most niche and elaborate scam.