They do grow normal Hass here, but you rarely see them in supermarkets. the company that grows them, exports them to Europe, and does process them into products for the local market ( Guacamole ). I saw fruit a few months ago, they looked nice just like what you would find in the States.
They do grow them at higher altitudes, you are correct.
I hope to get this Florida Hass, in the ground soon, its still filling out after my April butchering of it
Keep us updated on the FH Avocado, do you know what its real harvesting season is? productivity ?