I'm not so sure your optimism is justified. My experience with the Keen Targhee II is that that will be a one CF only boot. They were bought in the US last year when I was visiting there, and deliberately got very little use until I went to Spain in late Apr. On one boot, the sole had worn through at the heel after 300km, and by the end of a slightly shorter CF (I didn't walk from Rabe to Leon) the soles of both boots had compressed substantially. You can see the wear on both the heel and forefoot of the right boot, and compression effects on the left boot in these two images.
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In contrast, here are images of a pair of Scarpa boots with somewhat similar sole construction that I have used bush walking for the past four years, and the Asolo boots that I used on St Olavs Way in 2012. Both boots have Vibram soles, but I suspect that the Asolo boots have a somewhat softer composition than the Scarpas, just based on the substantial wear at the heel. Also, bush walking might be somewhat less wearing than the combination of sealed and unsealed roads, and trails of various types that are found on St Olavs Way.
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Clearly, the Keen boots have worn to the extent that there is little prospect of them being used again for the Camino, and they will now we relegated to domestic use. This is a shame, because the uppers are absolutely brilliant. They are certainly one of the more comfortable boots that I have worn, and I was otherwise very impressed with the design and construction. My wife wore the Keen Women's Gypsum Mid boots which she bought in 2013 to wear on the Milford Track, and wears regularly. The wear pattern on her boots is different to mine, but they won't be suitable for another long walk. She is similarly impressed with the comfort of her boots.