Those wheels look really nice, WORK CR kai's are some of my favorite wheels, the rota copies look just as good!
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I'd definitely go with more trimming over bolt on arches, it'd be a shame to cut into what seems to be a solid shell, and it'd be much harder to sell on in the future
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from the picture it looks like you have very little negative camber on the front, if any at all
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- i seem to remember the previous owner had some relatively high offset work equips and he had camber bolts fitted on the front to dial out some
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(all?) of the negative camber to stop them hitting his coilovers.
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it's probably worth getting a geo set up, dialing in a couple of degrees of negative camber on the front which will both increase your tyre to arch clearance and improve the handling too
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it may be worth dropping down a tyre size on the rear to 235/
40![](./images/smilies/spacer.gif)
17, that'll get you a few mm extra clearance too