Certified GKH Gardening Expert
I have always like the Carambola. The Starfruit. This interesting little tree would do quite perfectly in such a controlled environment. They make great container trees, as they remain somewhat short. But will produce, even from seed, at an early age. Usually this is around the 2-3 year mark. These edible fruit are a wonderful specimen for any indoor nursery.
Here is an article for more information: https://www.gardeningknowhow.com/edible/fruits/starfruit/container-grown-starfruit.htm