Euphorbia poincetia leucocephala

I have this tree in my garden that gets covered with White little flowers. It has small leaves and reasonably fast grower. The problem I see with it is the length of the internodes. It is a bit like maples with multiple shoots from a point and the length of the internodes.

It is a tropical or subtropical plant.

Here it is how it looks like when in flower:

Never found any bonsai made on the internet from it so it will be a trial and error experiment.

This is a airlayer I set up on the parent tree 3-4 month ago in winter, and it was ready this month.

For now the priority is to have it established so that the roots harden a bit. Then I shall remove the part of the trunk bellow the airlayer. The roots are just to fragile now.

It was planted in normal bonsai medium.