Give Malcolm up at Newtone a call, You can have whatever custom gauges, core sizes, lengths etc you could wish for, all for the price of a set of Rotos.
The only downside is an approx 3 week wait............well they are being wound just for you!
[url="http://www.newtonestrings.com/"]
Newtone Strings
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If you do give 'em a call, say Simon Poulton recommended them
Nice
Si