I keep seeing Trump's bond conditions misrepresented as a true 'negotiation' or discussion

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...but it's not clear the Defendant would have any good options if he chose to object to the conditions.

I wouldn't think Fani Willis or the judge would be willing to change any of the language in their order just because the Trump legal team objected. Their answer would likely be to remand him into custody if he didn't agree, and keep him there until he was able to take his objections to an appeals court - a venue which doesn't alter bond agreements unless appeals judges (rarely) find misconduct on the part of the prosecution or judge in question.

In short, appeals to bond decisions get adjudicated in an entirely new court. This isn't a negotiation.