Hi Gutcher,
My take on the Leeds printed copy is that the chap knew the ballad from oral tradition and tried his luck taking it into the printer himself. It's too garbled to have been worked over by an amateur poet.

I've decided to stop using the word 'hack' to describe these people who composed our ballads. It seems so ungrateful for what they left us.

As for 'William and Lady Marjorie' the only 'William and Marjorie' I have is a version of 'Sweet William's Ghost' Child 77, in Motherwell.
I'm no expert but if you can point me in the right direction I'll have a look. I have all of the usual collections including the Scots ones.