KoolKuna if you are dead against taps and/or font, it might be worth considering the impact of design (chest vs upright) on cooling loss from repeatedly opening the door on hot days.
The great thing about chest freezers with the pluto setup is you get minimal cold-air loss when you open the lid from the top. Bar fridge style you wouldn't want the kids to be in and out of the fridge a lot on hot days. At very least it would hike your running costs, potentially within a year or two eating away any cost saving from not getting the extra temp controller. Worst case you won't be able to keep your beer cold enough for your liking at the peak of summer.
My opinion is based on experience of having a KK1, which I love but wouldn't want to be opening the door in summer, and a chesty for cold conditioning that also keeps extra kegs on loose taps (its a keezer that I've never got around to making a collar for, so the taps sit on their kegs).
For the stand-alone KK4 budget you could pick up a 360-litre fisher and paykel chest freezer off gumtree (there's one in Albury at the moment asking $300) and have change after getting the temp controller.