Same here! I'd probably be able to finish it if I can bring it with me on the go!
You wanna know what's funny?
There's a way to get Realta Nua, full version, in English, running on your phone. Android or iOS.
Same thing for Hollow Ataraxia.
If anyone's interested, I can link some useful stuff here. (fan made patches, voice patch, etc. Nothing illegal)
Here's a proof video of me trying Hollow Ataraxia on iOS
Here's another example of this method working with full voice, but on a different VN
This is probably the best method if you really, really want to play the Fate/Stay Night and Hollow Ataraxia VN in English, and on the go.
If you're on Android, you can even grab Tsukihime and Kagetsu Tohya on the go as well (Though the Vita already has a forked version of VNDS Tsukihime.)