Don't know if this will be any help, but might give you some ideas of adaptable tunes of the sort you seem to want. Some years ago I was asked to play Amiens, the singing courtier-foreater, in a hippy-style production of As You Like It, doubling as musical director by setting the songs to traditional tunes. The ones I used were — Under The Greenwood Tree to the tune of The Gentleman Soldier; Blow Blow Thou Winter Wind to Here's Adieu Sweet Lovely Nancy; It Was A Lover And His Lass to The Little Beggarman; What Shall He Have Who Killed The Deer? to Hal-An-Tow; Wedding Is Great Juno's Crown to Kelvingrove (The Shearing's Not For You).