To start with tunes, there are two 'standard' hymn tunes of the title St George, in Hymns Ancient & Modern. 58 "God from on high hath heard", & 131 "Christ the Lord is risen today". As tunes they can be fit to many words. Sticking with the hymn book there's "Who would true valour see" (to be a pilgrim A&m 676)or, (not in A&M) "When a knight won his spurs".
Anything heroid or balladic would seem to fit.
"Chastity Belt" for some light relief ?