You might want to wait for the DFA 50mm release to see how it performs on the K1 for autofocus speed and accuracy. (Frankly though you'd expect them to have the 85mm out by now.) In my experience the screw drive lenses aren't great for accuracy around AF, and the DFA 24-70 and the 70-200 are by far the best focusing lenses on the K1 you can use for portraits. The 70-200 is truly great but it is heavy and expensive, and for that money you've got a new camera and change to spare.
I'm of a similar mind, dropping the K1 or keeping it for landscape and slower work, and looking at a different system for better AF, except I'm looking at Sony. A7 III doesn't cost much more than the X-H1. Eye autofocus seems to be a killer feature for portraits as to ease of use. On top of that, the spread of the autofocus points on the new Sony blows me away.
https://photorumors.com/wp-content/uploads/2018/02/Sony-A7III-mirrorless-camera-AF-points.jpg
The way that DSLRs cluster their autofocus points in the centre is a bit of a downside when you want to fill the frame... the point of interest in a portrait is so often outside the centre cluster.
Compare the A7 III spread with the Fuji:
Fujifilm X-H1 Autofocus Explained | Fuji Addict
That said, I'm only looking at the specs, I've shot with neither outside of a camera store.
Another factor would be to look at what lenses you want now and what lenses you want in the long-term, prices for systems.