I do about 8-12 technical slot canyons a year in Utah - most of which include multiple miles of non-slot canyon approaches.
You're only spending 1 day in a slot canyon, so I wouldn't worry too much about durability. If you coat the seams with Aquaseal, durability will definitely NOT be a problem. Traction is mostly overrated in non-technical slot canyons. You're not going to be climbing/stemming a lot and you're not gonnna be doing the Narrows. The Narrows is really a river, and you're in the water almost the whole time. The flowing river water creates smooth round rocks that can be quite slippery. Floors in wet slot canyons are mostly sand.
You don't need neoprene socks - waste of money. I've done some of the burliest colder canyons (i.e. Imlay - 16 hour day), where wearing two wetsuits or a drysuit are required and the water temps are just above freezing. While cold feet can be mildly uncomfortable while in the water, it's never that bad, and they'll warm almost instantly when you leave the water. Neoprene socks are a comfort item for canyoneering.
I wear medium thickness wool socks. Good insulation when wet, easy to wring out and dry. Good buffer against sand abrasion, which can easily create wounds on your feet. I usually dedicate mine towards canyoneering, since you can never get 100% of the sand out.
If you REALLY want new shoes and are just looking for an excuse, I'd highly recommend approach shoes (any REI or outdoors store can point you to a pair). Pick the pair from one of the major climbing companies that fits you the best - 5.10, Evolv, Scarpa, or La Sportiva. I like the Scarpa Cruxes. If you're dealing with a lot of water, drill a few holes in the back of the shoe, above the internal footbed. Buy/create some plugs that you can install from the inside. Use the plugs during normal hiking, and remove the plugs on water days.
Pros over 5.10 Canyoneers:
* They'll fit better
* No buckles to break (they're garbage)
* Drains better
* Just as sticky (climbing rubber on all)
* Can wear them for other activities