As a user I would like to see Axigen add the ability to both configure and add ARC headers to outbound mail and to validate ARC on received mail.
As a follow up to this for anybody who might be interested, I was able to integrate OpenARC with Axigen using a milter connection. Running Axigen in a container, and running OpenARC in a separate container and launching them in a stack. Works great to provide ARC validation and signing.