Have you looked into any of the aftermarket pulley systems? For example, March makes a serpentine set-up that uses a rod as the tensioner on the alternator versus the spring loaded ...
http://www.marchperf.com/pg30.html
I saw a real exotic set-up somewhere that moved everything outside on a big billet bracket ... Cant remeber who made it, but that March stuff looks promising if i'm understanding your problem
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