If you are willing to make your own sauerkraut from scratch (
recipe here), then you can control how sour it gets. After a few days of fermentation, start sampling it every day until it gets to the flavor you like. Then cap it and refrigerate.
Some people say not to rinse sauerkraut because it washes away the probiotics but others suggest rinsing it to reduce the sodium content. When I make it, I just use small amounts as a flavor component, so I suppose that would fit in with your "condiment" idea.
On another note, if you get into making sauerkraut, it's not that hard to move on to making your own kimchi, too.