Or run both hard and soft water to the kitchen, and then fit a separate drinking tap, or three way tap.
That way, washing dishes etc can be done with hot and cold softened water, cooking and drinking can be from the hard filtered/unfiltered water.
Outside taps IMO should also be hard, along with toilets (unless your happy to be flushing softened water and the money spent on softening it, down the toilet!).
On the other side, I've been drinking softened water in London for 16 odd years, and actually preferred the taste of softened over hard water. Only had two tap system but had both hard and soft water supply to the cupboard under the sink. Got swapped from cold softened to cold hard when kids were born and formula stated not to use softened water...
Now that I'm renovating, Ive fitted a 3 way tap (normal hot/cold + filter). Not bothered with filter, and instead put hard water in the otherwise filter part.