Not too hard to find 2.3.5 http://linorg.usp.br/pfsense/downloads/
RPi only has a single Ethernet so I would be back to router on a stick, and if that was possible, I’d be doing that now. Tons of cheap thin clients on eBay with a single Ethernet connection for those that can do router on a stick, some as cheap as $20 after shipping and tiny and very low power.
Going to keep looking and see what I can find for some kind of industrial usb-Ethernet device and see if the cost is decently low. Cost is an issue, so is noise and power. If noise and power were no issue, I’d just bring home an old Supermicro X7 series 2u server and fire it up. Our utility bill for the past month has really shot up with 2 people working from home. And I’m still waiting to get laid off, I can see it coming, just don’t know when. Probably after the semester officially ends in May and they decide I’m not needed to support classes for a few months.
For the time being, I drilled holes in the plastic case to try and vent the cheap usb2 device, also put it on an extension to move it away from some heat and clamp it to a blank rack panel.