That won't really stop the clicking. That's mechanical wear. What I have seen done, is reversing of the CVs. Where cash is really tight, you can swap left to right so that the wear is opposite.
With OEM CVs, having looked at a fair few, clicking shouldn't mean immanent failure. Yes they click on full lock, but they still give drive in a straight line. I wouldn't say this about an aftermarket one necessarily, but I can't recall actually having ever seen a fully failed OEM CV. Not saying it doesn't happen, but generally catastrophic failures are cheaper units.
Of course I'd change them, but I wouldn't rush to like I would if I found splits in my timing belt.
It's only a guess but I'd suggest that it's the casing that wears and the birdcage too probably rather than the ball bearings. It' a shame you can't get them rebuilt.
I know Toyota is a massive empire and has to pay its shareholders, but the OEM ones are very expensive indeed even at the sorts of discounts offered by Karl and CG. But you have to question even if you could get an OEM for £300, what does that say about a cheap one at £60?