I actually just did this in my Inert Sand Trials tank! I'd been growing Monte Carlo as an epiphyte, but wanted to see if I could get the smaller, darker green leaves of HC Cuba to work instead.
Yes, it does work. It grows extremely similarly to Monte Carlo, though I had both in the same tank and it was clear that the Monte Carlo was a faster grower once established, and less prone to algae.
HC Cuba tends to not like warm water, either. And needs a good amount of CO2, though I know you have that covered.
Also, lots of tanks use both MC and HC to give a sense of depth. Using the larger MC in the front, and smaller HC in the back, makes it seem like the tank has a lot of depth:

^MC in the front, HC in a few places in the back to enhance the sense of depth.
Here's one of the better uses of it I've seen, draping over rocks:
So yes, it will grow as an epiphyte for sure! It's become very common in the Eurasian diorama scapes.
My experience is that it grows almost identically to MC as an epiphyte, just slower and more prone to algae. Requires good CO2 and nutrients, whereas MC seems less picky.