As such, he also stood firm in refusing to offer more than one verse of a song,

Well lookya here. I would personally avoid any song book the only gave one verse of each song. When all you want is to sing a (s)(c)hanty, wot use is one verse? As a singer/wroncitter I can turn all sorts of verses on a sixpence. But your exposure will find you out. Throw in a knotty bowline with Paddy Doyle and, to be sure, someone will point-out bowlines were not used after 16 hundred and flumph. At least WMDoeflinger gives what he found, a snapshot of the item from one contributor, but a genuine example. So yours can be.

by way of example I extended a genuine collected two verse jobbie with verses including a Union Jack into a song about soldiers. And one grand-daughter of a sea-salt pointed out Jacks were for the sea, Flags for land-lubbing soldiers. I pointed-out the chorus included marines. To which some other ex-matelot opined "marines were nowt but soldiers on a boat". (sorry ship).

Basically, writing yer own verses is a huge spiked, poisoned chalice. Sip. Don't gulp