Peter, here’s another possible piece in the jigsaw:

Looking in 1841 for John Blaney, witness at Andrew Lynchey’s 1841 marriage, he was in the same dwelling as a Wm Quayle.

1841
Cronk Auld maybe ? Ballaugh

Ancestry’s transcription:

Name Age
Daniel Doren 40
John Bleany 35
Bridget Bleany 50
Ann Goidon 20

also in same building:

William Quayle 50 ag lab b IOM
Rebecca 45 b Ireland
Wm 14 b IOM

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The 14 yr old’s baptism shows mother Rebecca Holmes. She married William Quayle 1826 Ballaugh and Wm signed his name. You could compare that signature with the one you’ve already got.

Jean C