Installing socat on Alpine Linux - Home Assistant Supervised

I’m trying to access an AD2USB device remotely using ser2net and socat.
I can do this on an Ubuntu machine with socat. And, I have installed socat on Alpine. But…
/dev is mounted ro, so socat cannot create a dialout device.

It looks like I could trash my entire installation and install another version of HA to get socat. But… the official alpine version I have mounts /dev as read only.
I get that this is “not supported”, but dang - let my use my hardware! That’s why I switched to HA in the first place. (I am NOT using a docker container)

Any advice?
Or is there an alternative way to add my Ademco Vista->AD2USB over ethernet to HA?

Thanks all.