Good luck with finding a 3PH. I got one on eBay, but they don't show up that often, and sell for $165- $300 when they do show up. That's just for the hardware. Sometimes the hydraulics are included, but not always.
It might be cheaper to find a MF1450/1650 that needs serious refurbishment and has a 3PH on it. Some of the other parts on these will also transfer to your MF14.
Congrats on becoming an MF owner!!! About eight years ago I bought a 1650MF on e-bay for $152.50, went to pick it up and it had the rear PTO and three point hitch on it but no mower. I'm still useing it for mowing and yard work. I really like the looks of the older MF's better than I do the 1450/1650 style.