I actually love this idea and hope its what they do in the MCU. The Euro version of Shield. A mix between 616/Ultimate. Her being able to appear in other movies. Or the rumored Cap Brit movie or sequels if that ever comes to fruition. Man that made me so giddy. I hope that Cap Brit movie turns out to not be a rumor.
If you really think about it - if and when Marvel does their X-Men movie they are probably going to have the same focus as the FoXmen Universe. They'll just be better at juggling all the X-Men. So Psylocke in my opinion wouldn't be a priority for them when they start their movies. It's obviously gonna be focused on the 05/Wolverine/Storm but thats just my guess.