If this was my tree i would wire the trunk and bend and contort it as much as possible and let it grow. When new branches/leaders grow in and the trunk tickens I would decide on what style to go for. But if the trunk is brittle Just do minor bends but try to make it more compact.
Oh no I’m not done, I just wanted to make movement in the trunk. I decided that the way the trunk is I shouldn’t do a cascade so I wired the trunk and trimmed off the branches that weren’t needed. I looked at styles and decided on a Moyogi style. I am fertilized it a couple months ago and I will continue to water it and let it grow and thicken the trunk.