I took the cap completely off the container but didn't take any fluid out when I did them all and didn't have any issues with overflow, although I did go and check what it was doing after each wheel.
As for the front calipers, they don't have very much on them anyway so deteriation isn't the concern, I was more worried that the bearing grease would cause binding. If that's not likely to be a problem then I'm happy. I didn't do anything to the rears as everything appeared to remain sealed when I took the caliper off so it's as it was before I started so nothing to replace.
If I was to go back and swap out the grease one suggestion I was given was to remove those front pins one at a time which will should mean I don't have to pull everything apart and can do the fix while it's all in place which doesn't feel like it would take a lot of time or effort at all with a rattle gun and floor jack (Famous last words I'm sure ). Assuming I have a little time to kill I might just do that for my own piece of mind.
This is one of the recommended greases that I can find locally:
Bendix Ceramic Lubricant 10 pack - BENDIX | Repco Australia
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