Mangifera indica can not be grafted onto Mangifera caesia, and vice versa.
I doubt they can be crossed.
It could be possbile to use a intermediary species.
Durianlover, you made a really good job cleaning wanii seeds, they have been hard to clean for me! so much fibre!
Wanii is absolutely delicious, and it can be grown in florida from what I have heard.
Florida mango people shouldnt miss out on this one.
Gula pasir is good too.