In St. Lucia where I live there are no legal benefits such as pensions for expats with disabilities arriving to these shores.
Such persons usually come with their family member(s) on whom they depend for subsistence and most likely get some sort of disability pension from their mother country.
I have not heard of expats coming here for a job bringing their close family members one of whom happens to be a disabled person, but I have seen several cases where foreigners buy property in the island and bring their disabled close relative with them.
How is it where you live?