Paul - While the 47kohm loading would be correct on the MM input I don't think its 40dB of gain would be sufficient. From what I've read on the Grado Statement v2 the suggested gain is in the 54 to 60dB range and therefore generally recommended to use an MC input. It's possible that using the MM input may work in your system even with its 40dB of gain, but it's difficult to predict whether you'd be able to reach desired volume levels without restricted dynamic performance.
If you have the opportunity to try one in your system before purchasing it could be worth a shot but based on the specs I think you'd likely end up having insufficient gain. The Grado's requirement for high gain at a 47kohm load is rather uncommon and has been mentioned in reviews as a potential compatibility issue with many phono stage designs. Wish I could give you a more definitive answer!
