"just see Bronson as a starting point would be my advice."

Indeed. Using a given tune for different ballads seems to have gone on in tradition, so no reason not to switch them around now. Or use phrases from two different tunes to create a new one. Or tweak a collected tune, like Tony Rose did with "Banks of Green Willow".

Sometimes, though, the song as collected is so good that it doesn't need to be tampered with.