Arundel cages went on and work/look great.
Pauls Racer Medium went on a while ago and gives more guard clearance on the front. Also looks cool and is quite powerful.
The VO rack was a non-starter. The front end geometry and stem position doesn't play well with the decaleur. This is a shame as I thought the whole Road Runner x VO rando bag would be super cool. Not going to have much use for them so probably going to sell them on.
Ended up getting a Nitto M18, which fit well after a bit of fiddling but took it off in the end as I wasn't using a bag on it much or doing any super long rides.