Kishalee,
I too am a dual-citizen Jamaican getting married at home, and I am having a traditional cake at my wedding. If you ask Chandlyn, I'm sure you can arrange to get a traditional cake at the wedding whether she gives you a referral or you bring your own cake. As a Jamaican, adding rum to the cake is just not going to cut it.
Last year my mom made my cousin's cakes for her wedding and brought it on property to the Sandals Royal Caribbean - they even dressed it at the resort for us for free - just ask nicely.
My mother won't be making my cakes this year, but a friend of her's who bakes for a living is making them. If you'd like her contact info PM me, and I'll pass it along. It won't cost you $500.
One other thing, another of my cousins who got married in JA actually travelled with her cakes from CANADA to the resort!! So it can be done, just carefully!!
I'm sure you can figure something out.