I think choices are always a good thing. But I don’t think the current system will allow you to choose loadout equipment for a profession. What you COULD do however, is copy the existing Bow Hunter Profession, rename it to X-Bow Hunter Profession and swap out the bow for an x-bow. Or maybe Bow Hunter (Crossbow), so they would appear right by one another. Then you’d be able to choose at character creation which one you prefer.
Tack this onto the bottom of your profession.json. Don’t forget the comma seperating the entries:
"name": "Crossbow Hunter",
"description": "Ever since you were a child you loved hunting, and you soon took a liking to the challenge of hunting with a crossbow. Why, if the world ended there's nothing you'd want at your side more than your trusty crossbow. So when it did, you made sure to bring it along.",
I don’t know anything about bows, hopefully that quiver will work with bolts…oh yeah I need to add bolts instead of arrows. one sec.
edit: ok, it’s got bolts now. How do metal bolts compare to carbon fiber arrows? I’ll leave the balance up to you. All the relevant entries are in data/json/items/archery.json
edit2: If you’re feeling perfectionisty, you could add xbow_hunter to the infected, burning_building and wilderness scenarios in data\json\scenarios\scenarios.json. It wouldn’t be a hard thing to turn this into a simple mod.
edit3: Since the list isn’t sorted alphabetically, I changed the name to Crossbow Hunter. Also fixed the description to reflect the choice of crossbow.