Shellfish Allergy & Vacationing in the Caribbean

Hi all! I’m planning to vacation in the Caribbean this December. Having lots of difficulty choosing an island in particular…..

My boyfriend is deathly allergic to shellfish. He definitely can’t eat it. He can be around cocktail shrimp with no reaction, but if a waiter walks by with steaming shrimp fajitas, he usually has to exit the restaurant until the steam/smell has faded. He typically doesn’t disclose his allergy at restaurants unless we’re eating at a seafood centered restaurant. He doesn’t carry an epipen but I will 100% make him bring one to whichever island we choose.

Is cross contamination a serious worry at local restaurants? Would we be better off staying at a resort that will be able to accommodate the allergy? I’m looking forward to indulging in the local cuisine (including shellfish) personally, but want to make sure my boyfriend will have options/be safe eating at local spots. We’re not looking to cook ourselves too much as we’re slight « foodies. » Most of the information I’ve found online so far pertains to cruising in the Caribbean, but we are not looking to take a cruise.

Bonus points if you know of an island better suited for people with shellfish allergies. TIA!