Just remember if he comes under Fiance visa you have to get married within 90 days from arrival. Then it takes right now 3 months to process a work permit and temporary residency.
In 2 years he applies for citizenship, even if you are divorced within 8 months after marriage, he still has the right to apply .
For him to come as fiance and get married he will in total be able to work legally 3 months from date of marriage .
Are you ready to go that far? Working under the table is risky depending on the State you are in !?