Sadly, it doesn't seem possible to proceed. I tried a few different NICs connected externally via thunderbolt (including a dual X540 and Thunderbolt enclosure that I use on most of my 2013 Mac Pro's) and USB to try to get past the no NIC detected screen, but I get pf exception 14 in world 2097152 with any of them connected. I even tried 6.7U1 despite the fact it can't boot automatically on 2013 Mac Pro or older Mac Mini.
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