Hi Peter,
Have you looked through the dozens of Lynchey threads in the board archives? For an archives search see:
cse.google.com/cse/publicurl?cx=015963515104481468111:hafvd27virc
e.g. Marie Radcliffe put on a list of Brian L's dissenter bapts which included a godfather Charles Lynchey:
"15 Nov 1844 Lynchy, Charles of Andrew Lynchy & Jane Irvine g.p's Charles Lynchey & Anne Gallagher"
www.isle-of-man.com/genealogy/messageboard/manx_archive_2.pl/md/read/id/522671
Sorry, it's been several years, and I've forgotten the details of your families so don't know whether this was the same Andrew.
Sue