So you can get an accompaniment CD of Christian Hymns II. All appears to be played on a real live piano by a real live pianist and recorded in MP3 format by number in the book.
I got the CD and loaded the lot into a Dropbox folder. That way wherever I have internet access I have the accompaniments on my computer or on my phone.
We tried it out in anger last Sunday evening, using it for the tune Thaxted (which is seriously wrong for guitar) and it worked fine, apart from being pitched just a smidgin too high. But even that's fixable if you have the time and energy to detune everything using Audacity os some similar MP3 wangler.