Grafting Borneo durio to zibethinus rootstock

[tongmuan]

We have 3-4 year old seedlings of Borneo forest durio (graveolens, oxleyanus, dulcis, lowianus - two of each) in our small backyard garden. We are considering getting more land, and in that case I would like to plant these in a bit bigger scale.

Are the other durio graft compatible with zibethinus (durian baan) rootstock? Searching the forum the only related result was fruitlovers saying in 2015 that graveolens should be compatible with zibethinus, but maybe someone on the forum has practical experience of successes/failures already?

Also, what would be the best case flowering scenario for trees grafted with scions from 3-4 old seedlings? I assume it would be slower than scions from already fruiting trees, but might still be faster than planting seed? For example, according to info on theferns, for example graveolens from seed might flower in 6 years.

[Finca La Isla]

I graft lots of zibethinis but I have never done any Inter species grafts of durio. However, I have heard from a reliable source in Malaysia that graveleons makes a good root stock for zibethinis. But, I know somebody here in Costa Rica that is a very good grafter who attempted 30 grafts of zibethinis on graveleons and none took. And this guy is good. So…
Whether grafting scion material from a 3-4 year old seedling could cause the newly grafted tree to produce earlier is something to ponder. I don’t think you’d really ever know. How long are those Borneo durian seedlings going to take anyway? 
We’re growing all that stuff but only our zibethinis is in production. I have been successfully grafting a durian hybrid called Bungah Merah onto zibethinis so that’s pretty exciting for us.
Peter