I'll begin by stating I've never tried what you are considering. Have you had problems with the stock location?
My thoughts, off the top of my head, FWIW:
I'm certain you can make it work but I'm not certain you'll get much return on investment or beneficial results. Possible problems, as I see them are:
1) Although there is probably room to locate the air intake under the hood, it will probably preclude you from ever adding accessories like a accessory fuse box, winch contactor or OEM windshield wiper, etc. I assume it does rain in Tuscon from time to time and probably gets cold there too. An accessory fuse box will be useful if a heater is installed as well.
2) The piping necessary will be pretty long and can't be very large if it is to run through the tunnel. There isn't a lot of extra room in the tunnel. If you use flexible ducting with a wire helix it will add considerable restriction to airflow over that distance so a smooth piping would be best. The piping for the radiator also runs through that tunnel and will may tend to heat the intake air as it travels from under the hood to the intended destinations. Heated intake air isn't the best for engine performance nor for cooling a clutch.
3) I'm not too certain that air picked up under the hood will be any "fresher" or cleaner than air picked up in the OEM location. The area under the hood of my 2015 Ranger 570FS (like the 900 XP) gets dusty even though I don't ride in lots of dust. If you are following others on a dusty trail the dust they kick up will be as likely to get under the hood as it is the stock intake location. The areas to the left and right of the area under the hood are open to the dirt and dust churned up by the front wheels. At high speeds that dirt may not enter under the hood but at lower speeds I think it's a different story.
I think that if I were to be considering air intake relocation it would probably be via some kind of a snorkel system with the intake up on the roof. At least the air would be cool. You might be able to adapt some kind of air filter/air box system from an automotive application and use a large pleated paper element filter which is inexpensive to replace. It may not be the prettiest thing but a round steel air cleaner from an old school V-8 car or heavy duty truck will provide more airflow and more filtration surface than any 900 engine will ever be able to consume and it will be fairly rainproof becasue even under the hood of a car rain makes it's way through the radiator to the top of the engine and that type of air cleaner canister is made to deal with it.
It might be worth inspecting the air intake system on a Humvee, which is designed to cope with all kinds of dirty intake air, if for no other reason than to get ideas.
I think Polaris makes an air intake relocation kit that relocates the intake inside the cab. It may be marketed for snow use. Using it may increase noise in the cab but the air should be as cool and clean as what you breathe in there. Perhaps you could start with that Polaris kit (if it exists) and run the piping up the back wall inside the cab, overhead along the roof and pop out through the roof above the windshield with some kind of cool looking low profile intake scoop that extends from side to side above the windshield. You would still have the original air filter to deal with and any dist kicked up by others you follow but I don't think it would be any worse than what would be picked up under the hood.
Another option might be to run along inside the tunnel and pop up inside the cab under the dash to pick up clean interior air. Of course the problems I mentioned earlier about the tunnel piping would still apply and the addition of a heater would complicate things due to space requirements, but the room under the hood would still be preserved for other accessories.
I don't know if any of these rambling thoughts will be helpful, just tossing them out there to confuse the situation.