Should never have to replace chain unless you get 200+k. There is good info including KIA training and tech info online at: Kia.com, Owners, kia tech info, which brings you to GDS, I have had a password for years so I assume owners can still get an account.
You do need to have valve clear adjusted at 100K according to the schedule but mostly if you keep the lube good and nothing else happens or was built wrong and the car is not making unusual noise.... why go through the expense? I think that this will be a big bill. To replace the tensioners on mine they had to remove the motor.
George in WI.