All the accessories are available thru your dealer. Or I would suggest you shop around. Go to the
Hyundai Shop | Hyundai Accessories, Hyundai Parts, and Hyundai Merchandise and you'll get better pricing. I've dealt with the hyundaishop.com on several occasions. They are a straight forward OEM accessory dealer. I had a problem with a damaged shipment from UPS and the quickly remedied the problem. They are dependable and their prices are about as good as you're going to get. Also shop on eBay for accessories. The alloy pedals were only $19.95 w/free shipping, which were about $50.00 cheaper than anyone was offering.
Make sure if you opt for the window deflectors, you purchase the more expensive units. I believe they are normally $250 but the hyundaishop sells them for $194. They're actual Hyundai units which are very well made and are held on with metal brackets and adhesive. The lower priced units are aftermarket and are held on by only adhesive strips only.
Stand by, there will be plenty of aftermarket accessories available for the Kona. It's popularity is vast and this is were the aftermarket vendors come in. Just be patient, I assure you there will be plenty. Ebay already has plenty on hand. Just do a search for the Kona and check the worldwide block in the left side.
You really don't need the "remote start," as it is available on the Blue Link app you can download to you phone. Blue Link comes with your purchase for three years free. Go to the app store for your phone Android or Apple and download it. You have to register and voila' you have remote start, unlock doors and much more.
https://itunes.apple.com/us/app/myhyundai-with-blue-link/id893514610?mt=8
Cheers & Mahalo!