Brilliant idea, i also second the @stelagel’s idea of having bananas and grapes as well, because for those we also don’t need any new trees.
I would just add one little request in this matter:
Let it not be just the drop bonus in edible fruit, but also few visible fruit “nodes” on those trees, considering graphics… How about this? If it would not be too much of work of course. 
I would also suggest the fruit be at least a bit uncommon to get. There would be trees with the nodes and those without them (similar to the existing aloe plant with and without the blossom in the middle). One should have to be looking thoroughly to find the fruit node tree between the regular ones.
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