Keep in mind that if you do a full on styling now, the trunk will only marginally thicken over the next years. I would personally want the trunk to be bigger. Jabuticaba has smallish leaves but not extremely small. And the fruit will be about an inch in size. With a small trunk that might be a bit odd.
If you want a bigger trunk, you might not need any wiring now. Just prune to size so you can bring it home. And at home let it grow the trunk first before you continue with full on styling.