I just typeset the original Neale translation (mostly) into (a slight variation to more closely match the Vatican Edition of) the metrically-realized version of the plainchant Vexilla regis that is found in the Worship hymnal, based on the realization by Schola Antiqua, marked for alternation between choir and congregation.

I'm looking forward to using it as a processional on Thursday and maybe you will too...

I'm afraid I extemporize my accompaniment so if you need an organ score you're on your own. End of the first line should be a Dmin-sus2, if that helps.