Guyana is poised to become one of the richest nations in the world per capita GDP. However, there is not a Sikh community. The few Sikhs who are there come to work then return to India. My father had a very good Sikh friend who did that. Guyanese are every friendly people so perhaps the next best thing would be for the person looking for a gurdwara to engage with a Hindu mandirchunok ...obviously eh doesn't have to convert but it may give him a sense of community.