Since you are in the southern hemisphere and it is still well before the summer solstice, you can certainly do an apical cut.........your plant will have another 2 months to recover before flowering commences in February, therefore, plenty of time!
Giving it an apical cut will limit its vertical height (which may be something to consider on a balcony) and encourage the side branches to grow more, so that you get a more rounded bushy shape, rather than a tall tree.