I think carbon makes a lot of sense for a lightweight touring bike. The problem your going to run into finding something with mid blade eyelets, I have not found one. I know there are a few bike builders that have forks 'customized' by the likes of Enve or Whisky (and use them on their builds), but the forks are not available direct based on my research.

I even reached out to Ruckus, who specialize in carbon fiber repair, they said they couldn't (or wouldn't) do it.

Regardless of what our these retrogrouches here are saying, you won't have any worries about using a carbon fork. They are stiffer, offer a very nice ride and are stronger than a comparable steel fork. I was never a believer, tentatively got into carbon, crashed hard several times with no issues, so I got comfortable with the material. Carbon MTB rims for multiple seasons of racing, no truing and no breakage...can't say the same with any of my Alum wheels. With that said, I'd stick with a CX fork from a reputable manuf like Whisky, Enve, Reynolds, Etc.

I looked into this seriously a few months back, what I'd personally do is get a carbon Canti fork with eyelets and use a Rando type front rack with a Rando bag...something like this:

VO Pass Hunter Front Rack - Racks & Decaleurs - Accessories

Have I made the jump.....no, I still use steel because it's what I have and have no reason to dump my stuff and upgrade. But would not hesitate to use carbon from a quality manuf.