Was the whole plant stored outside during winter? I am surprised that it even survived that. The first picture of the trunk looks dead. But it does seem like roots are forming. Is that part low down the main trunk? cannot figure that out? And is the upper part with green leaves current picture? If so you cutting it at the damaged bark portion can be rooted. But it is quite large. I think a better option will be to air layer it. Look up air layering if you are not sure or ask here and I can provide some instructions on it.
