Sorry for the spam, I seem to post this regularly but the Ubiquiti EdgeRouter Lite will happily run OpenBSD. It supports the onboard packet accelerator with some extra configuration.
[1] https://www.openbsd.org/octeon.html
[2] https://news.ycombinator.com/item?id=10079210
[3] https://an.undulating.space/post/180411-erl-openbsd-upgrade/
Unfortunately I was wrong and the post is just for cryptography acceleration. Will have to check the commits to see if any other work has been done.
They're basically the same hardware.