Just to update followers and searchers about the pomelo tree in a pot, the unsuccessful fruiting and the new flower buds, we have success at last!!!
After many attempts at providing fruit, the tree finally succeeded after I switched to goat fertiliser, and wrapped the fruit up as soon as they were of decent size.
The end result were two good-sized pomeloes weighing just under 1 kg each. The flesh was soft, juicy and most sweet!