You were right about the Dunn version. I'd seen the lines before but they are in US versions:
Through 'braces and kisses they parted that night, She started next morning for to meet him by light; [from Cruel Ship's Carpenter --Sung by Captain Pearl R. Nye, (1872-1950) on November 3, 1937. Recorded Lomax]
Now I need to compare the the traditional version to your chart :)
Please transcribe Findlater's version. I only have one edition of Greig/Duncan and it's not in it.
It's safe to say the both of the early broadsides Roxburghe/Deming were not traditional in Britain or else they would have been collected. There are 7 Canadian version of "Gosport" and four or so from the US, including the Nye version which corresponds to Dunn's fragment.
There's a Pretty Polly version Flander's collected from Sulivan in VT and the recording is online here: https://archive.org/details/hhfbc-cyl40 but it's so bad I can't make it out- anyone? It may be a different song.