Evan,
your looking at the Blessed Island, according to the Spanish, hence the name Trini -dad [ Holy Trinity - Catholica ]
1/2 a degree out of the path of Hurricanes and no real tropical storms, just heavy rain, and strong breezes.
Back in the 80's when World Tropical Bonsai [ the magazine out of Florida ] came out. Christine Rojas, I believe. It took a trip to our local Herbarium at the University to identify the Buttonwood.
Later the few ones that were found with driftwood and were not loaded with termites, didn't survive for long or were dumped, because when they regrew, they didn't have the appeal visually of a Shimpaku.
Interest very soon fizzled out, and today, very few are even around in Bonsai form.
Which is why more interest went into the more natural shape for us, with contorted dark bark and domes.
Anywhere from 24 to 36 inches would probably give the best effect.
The cold on your side, gives and preserves the interest.
So in the future look for our side showing 5 to 6 inch contorted trunks and domes.
Our climate is very mild, domes and healthy trees are the normal situation. We look to you guys for the ancient look.
Good Day
Anthony