Hi DJS,
You can safely repot after flowering and yes you can get an apex by the replanting angle and gently wiring up some young growth. Dont be too confident on bending though, your limb will snap clean off without warning. All sticky wattle owners have at sometime learnt this lesson.
The visual impact of the cascading foliage improves if you keep the branches clear of the pot rim and sides. Do this by removing inward pointing growth. If you gently lift a limb you will see that these are the downward pointing ones on a standard tree. Treat it the same and you will see your pot and clear the rim.
You do have a nice tree there but you need to bear in mind the bonsai basics. You need a front. You need to see that trunk. You need an apex. Thin out to give negative space.
Try to achieve 'Dragons Claw' branching. these trees are perfect for this. Just take a look at thet dragon Smaugs claws and you will get the idea. They naturaly send branching upward then curving downward.To encourage this selectivly remove branching from under upward and outward growing ones. Leaving the side growing ones helps the effect too. Apply this method all the way down each limb and you should after a few seasons be left with ramified claws all the way down. Try to get the 'claws' closer together the further you get to the end of the limb. Again exactly as you would want in a standard tree. Treat it the same.
I have seen many of these with huge masses of foliage with the trunk not visible at all.!!
Difficult to explain the method without seeing a demo of it being done.
Don't do all your pruning work in one hit. Do a portion at a time over a few weeks so as not to stress it out. Use cut paste. Only remove bottom 25% of roots and always try to over pot them. They need lots of space for dence root mass like azealeas. NEVER LET THEM DRY OUT. I have mine in summer in a dish of water always filled up to the drain hole. Slow release native fert in soil mix and seaweed based liquid watering. (low phosperous)
Always design with asymetry in mind.
Many varients on this method but I have success.
Have included a classic example to show what can be achieved. One to truely inspire all Howittii owners. Enjoy and good luck.
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