Trunk from root. Azaleas

I bought this Azaleas in Japan. They are 2 and unstyled. Just wanted to show you how they have done the root system. I want them first to get used to this climate and they are covered with buds. I removed most of the buds but left few just to take a picture and they will be removed also. After that the trees will be styled.
I think this is a useful idea to create a bonsai faster from material that thickens trunk very slowly. But I suspect it will be more suitable for shohin sized bonsai.
The roots are filled/packed with moss, and some muck and tied gently so it is held in place, with a hole on top for watering. That is kept in place until the roots are developed well and able to keep the medium.

This can be done with other varieties too.

It looks a bit like ROR, and exposed root in concept and appearance.

I was wondering, if one day after the roots have thickened nicely if I can remove all the medium slowly between the roots and make one of them a ROR. It might look nice.
What do you think? Any ideas?