You can't reconstruct it from the MIDIs. MIDI already throws away too much information in the score (slurs, phrasemarks, gracenotes, barring, repeat structures). You'll only have leeneia's word that she's told you about what's missing, and given her attitude, I imagine "nobody needs to know that" will mean a lot gets left out.

What is the problem with simply taking a photo of the page? The old advertising image on this page on my website

http://www.campin.me.uk/Music/MouthFlutina/

was taken from a book using available light and a digital camera I bought in a charity shop for 3 pounds, edited with free software on an old Mac I got for free. It isn't pro quality but its resolution is plenty enough for a hymnbook score.