Can I graft a Jacaranda tree with a scion from a preferable form? Note that I am not interested in sowing seed (they self sow) or in taking cuttings (too slow). Thanks

What do you mean by "preferable form"? Trees can be grafted onto closely related trees, but they will not "take" on totally different types of trees.

I am referring to the same species of Jacaranda, J. mimosaefolia. There are different forms of that species. I am not referring to plants of a different species nor of a different genus. A form is a variety or to some people a sub-species of a given species.