Just a thought, but has anybody looked into fitting an FCR off another bike? The big KTM EXCs come with a 41mm Keihin as far as I know.
The DR crowd, while not as cheap as the KLRistas of course, likes to re-use the 39mm FCR-MX from YFZ450s. I have one on mine, cost me $140 and I have seen them go for cheaper.
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12 690 Enduro-R, 12 Husaberg FE570, 09 KTM XC-F/ 450 RFS hybrid, 07 KTM 450 SMR, 09 BMW F650GS twin/F800GS hybrid, 03+05 YZF-R6