They pretty much laid out why it'd never be the Vita versions. Multiple times. I'm sure someone will dig up some quotes. And it's highly unlikely they'll localize the PSP versions of Zero and Ao/Azure, but Zero has a Japanese PC port they can work with. Ao/Azure is honestly the biggest roadblock: Falcom never released a PC version themselves but one was slapped together by a Chinese company that, if I recall correctly, doesn't exist anymore? Or maybe they just no longer have the license (i.e. it's no longer sold)?
We're not absolutely certain they'll bring over the Crossbell arc, but the fact that they're going ahead with The 3rd raises the possibility from 'nah' to 'so you're saying there's a chance' status.
That Chinese company is fine. But they have to replace the Chinese text back with Japanese text, and then let Xseed do the translation. Not sure if they are willing to do It.
I don't know why Xseed can't touch the PSV version, but they always have the option to release the PSP version on PSN.
Seriously, why can't Xseed use the PSV version?