Add -- Having looked at Jacob's Will a little more, he initially left his money to the Synagogue and to the Jewish poor of the area. So I googled Isaac and Barbados and came across a ' Reform Judaism Magazine - Miracle in Barbados' which has the monumental inscription of Rabbi Benjamin Massiah who died in March 1782, it also refers to a book of Monumental Inscriptions for Bridgetown, Barbados, which if available now, may be of interest to you. Try 'reformjudaismmag.org'
KR - Angie