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Try SUB-20 http://www.xdimax.com/sub20/sub20.html
It has 2 MDIO channels. One is CFP compatible running at 1.2V with 4MHz MDC frequency.
SUB-20 has integration modules for LabView. Low price, good support, reliability. What else?
We use SUB-20 as I2C master as well and also via LabView module.