Check out Passport Health although they are in Rhode Island and I am not sure if that is far away from you but it may be worth it for the piece of mind knowing you have the correct test.
It seems they will know exactly what is required. Not sure on costs and if personal insurance will cover any or all of the costs.
It also seems that arrivals to SXM can arrive without proper documents and results and have test taken there for $125.00 and "quarantine" until results come in. Seems results are the next day.
The bad point of that is if you do test positive you have wasted your vacation.
We are probably not going at the end of August for a scheduled two weeks because of the difficulties and things that just could gone wrong.
It really is hard to not go even if only traveling on the Dutch side.
Don't bother looking at any SXM pictures as that just makes it harder.

Who know what will be going on by September.
If we did go we would be leaving to go home on September 12th.

Need any more bad news.
The Flyers rocked the Bruins.

Hoping your trip can be successful.