Yes, there are vegan versions or replacements, and there are plenty of people (cooks) who won’t even register that a sauce might not be vegan and use them. Source: personal experience. If this isn’t a problem around you, I am happy you don’t have to scrutinized menus like that.
I’m not from Austrailia, but the general rule for pruning is that up to 30% of the crown is ok, so I wouldn’t worry at all about 10%.
This might already be your plan, but the best branches to prune are the ones with the most leverage. Those are the tallest and longest ones. The least effective will be the shortest, lowest, and closest to the trunk.
Unnecessary info: Trees need leaves to make food, but leaves use water and other soil nutrients. Trees need roots to gather water and other soil nutrients, but roots don’t make food. The balance in pruning is between these two things. Cutting off branches in the hot and dry will probably actually help the plant survive because you are reducing water demand during a time when food is plentiful. The trick is to not overdo it and starve the roots. That’s where that 30% idea comes from. Almost every plant will tolerate that amout of cutback without taking root damage.