Just "mod" post
After couple days of testing different m.2 adapters, network cards and other stuff, finished my first tiny proxmox host node.
HP Elitedesk 800 G3 (i5 7500, 16GB ram, 256GB nvme) with m.2 a/e realtek 8125 2.5gbit network card /w 3d printed bracket (replaces detachable displayport mini card).
It works flawlessly. Original gigabit nic used for kvm/vPro only.
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Google photo gallery
Bracket is my work - will post it somewhere (with update of this post with a link), ping me if you need it sooner.
Aliexpress links:
variant1 variant2