As a 13F, if I don't want to be stuck in Artillery, would I be better off trying to commission as an officer or go down the warrant route?

talk to the WO branch and see what you qualify for. Sounds like you're a hands on guy, you'll probably be happier as a Warrant Officer. my .02 but SFC (Join to see) is the Career Counselor.

If you're good at what you do, why change? Get better at it, an expert even. Arty is the King of Battle. Go Regular and you're expected to be a generalist. Some SNCOs did go WO and get another skill, but few, and they went to high demand MOSs with a short learning curve. Expected to be specialized otherwise. Range Safety Officers for a few former shooters. May not apply to Army.

Almost all Warrant MOS' will give a look at a Soldier. Simply put together your qualifications and email the Proponent CW4/CW5 listed on the MOS page. They will let you know if they will accept a packet from you or not. I did it from Civil Affairs to Electronic Warfare, I know a person who was told he would be eligible for 170A (Cyber) and he was Psychological Operations.
Both the 880A and 881A accept any MOS, and there are other MOS' that accept 13F. Go through the Warrant Recruiting website and check out any and all MOS' that interest you.