Hmm... I have zero experience with a tropical variant of comfrey... Or a tropical anything of anything for that matter.

As for what Comfrey does, it is called a dynamic accumulator. It goes deep in the ground (I've heard up to twelve feet or 4m) and brings up minerals in bioavailable form. Yes, trees can definitely go deeper, but not many other things do. It's NPK I'd 1.8-0.5-5.3, it has up to 35% protein (massive for a plant), and is a very high source of B vitamins; I think B12. Folks use it as a compost activator and for comfrey compost tea. It is also widely used as a chop-and-drop fertilizing mulch and a living mulch. None of that says anything of the medicinal uses either.

The idea is to have a multi-function food for the tree very close at hand. It's less work than growing your compost and mulch on one side of the garden and your trees on the other. More efficient.

For a source on tropical matters, I know Geoff Lawton is in the sub tropics, so kind of a middle ground between your tropics and my hot temperate climes. I know he works with bananas a lot, and I'm pretty sure comfrey too. It may be compatible with your area.

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