So funny you should mention that at @mrams, the customers originally had me design this with a beer keg to the right of the sink. But in the end was worried that his beer drinking would increase too much! :). I thought it was a noble challenge.

An in-counter kegerator would work on the right. You can mount a tower above it. If there is air between the keg and the counter, you'll need a PVC pipe and some pipe insulation inside it to minimize thermal loss and condensation. Or use a picnic tap in the fridge (open the door per beer...).

If you buy torpedo kegs, you can easily support 2 or 3 beers.

Beware that self installs can be frustrating while you deal win foaming, temps, and pressure. It's a black art until you find what works for you.

PS pick up a home brew/Pepsi keg adapter from the local HB shop, in case there is a supply of homebrewed beer available.