The proof is always in the eating and if after a reasonable period the wear issue really is resolved then I'll happily eat my wordsI'll have to disagree with you on this in my case. The rear tyres wear normally & after a comprehensive check on the front & rear components to eliminate wear or damage,tyre pressures, rotating tyres, decided to try the bolts.
I had previously had a 4 wheel laser alignment from a highly recommended garage
http://www.thistlethwaitestyres.co.uk/align.htm
Which was useful but the problem persisted.
For around £40 for the bolts, seems cheaper than 2 tyres every 6 months.
You seem to be saying that toe-in is as standard spec but I'm a little uncertain of exactly what you've set the camber to (and why you chose that figure) :chin:
I'm a little surprised you don't suffer outer edge wear on the rear tyres too as this is quite common for cars which use a rear torsion beam (if driven enthusiastically )