Another cheaper option, buy a set of slicks for the Kona. Ride that on the road for a while. It will get you back in traffic, and comfortable in traffic, on a familiar bike. You'll know where the shift and brake levers are, and how they work, so if you get into a spot of bother, you'll be better prepared. And if you suddenly realize that you hate riding a bike(if that's possible), you’re not out a lot of money.
Where do you ride?