Growing ficus elastica to have one trunk?
I would like to grow my ficus to be like an actual tree with one bare trunk.
Like this (not my image. only a link to what I'm talking about):
I have a ficus elasctica burgundy that is about a year old and so far only about 20" in height but its in decent condition with whats its been through. The pic is below. It seems to be 'one' plant but has 4 main trunks and several smaller ones. I'd like to remove all but one trunk and let it grow (with just one trunk structure). The arial roots can stay as I find them appealing.
How would I do this? If I pruned the other trunks wouldn't they just grow right back? I'd like them to stay gone. Perhaps prune them in the winter??
Also, I'd like to the trunk to be about 3 feet up before it branches. I know this would take alot of time to grow to this height and that I'd likely have to grow well beyond 3 feet before I pruned to get back budding into several branches at and over the 3 foot line.
So, the question is, how to do this? Examples if possible. Would love to see pics. And possible time frame? I'm thinking this might take a few years, but I'm patient.
Any ideas or suggestions are appreciated.
My current tree (currently i cannot upload as bandwidth is too low):