There are five other Thomas Cubbons christened in Arbory between 1790 and 1810.
If he was still on the island, he may be in the 1841 or 185 census. Do you his wife's name and names and DOBs of children? If so, you may be able to identify him in the census through her. Then, with luck, you may have his age which would narrow down his possible parents.
Bruce