In about a year it'll be good to repot. The thing is: you either do it when they're young and have very few roots, or you wait until they have a nice root system established that can mitigate the damage you'll do with repotting.
Both ways are correct, both have their benefits and drawbacks. I prefer waiting a little bit longer, about a year, before I do any root work. Simply because I want to get to know the plant a little, I want to see what it does when it has issues with water, I want to see how it responds to damage, I want to see how the soil behaves and how much the roots grow in any given season. If something goes wrong, I'll know the signs and I'll know how to fix them and in which time span. This also helps with timing the repotting: not every tree can survive a summer repot, not every tree can survive a winter repot.
The trunk is too soft to be wired, any wiring would probably damage it. But you can tie some string to it and slowly bend it little by little. Or wait a bit longer until it produces some woody structures and bark, so you can actually put some force on the wire.