I'd love to see an open hardware router board. Especially if I can run OpenBSD on it, and with no blob drivers.
Even a 2-port board that could be married to a vlan-switch would work.
Would the board in the below answer be OK? If not, why not?
https://www.olimex.com/forum/index.php?topic=765.msg20858#msg20858
I suspect that no-one else here knows which boards would meet your wants (because they don't much about Open BSD and/or don't know which are blob-free).
John