Well, if the community can get it together and purchase a license for the sdk, there is very much the possibility of a legal wm6 version, see this thread
http://www.aximsite.com/boards/x50-x...-licenses.html
Mind you this has stagnated for a couple of months, but it IS doable.
And if you are willing to trust a 3rd party rom, more power to you. I use my X51v for business use and have VPN tunnels and other confidential software and data on it, so there is NO way I'd trust a 3rd party rom at this point.