With this, you have convinced me that your interpretation is mistaken.As written, some 2024 items upfront state that a magic action is required for activation, some 2024 do not state that a magic action is required for activation. It will be a DM's choice if those that don't specify a required magic action would still qualify for Fast Hands. A very strict reading would require the item to state that prerequisite.
Activating a scroll takes an action. Actions are listed in ch 1 and in the glossary: which action is it? The only plausible candidate is that it is a Magic action. That should settle the matter.
You may be right that it is helpful to think there are two types of magic items: those that cast a spell (like a scroll, and casting a spell takes a Magic action); and those like a wand with charges that may not be casting a spell (which would also take a Magic action. Again, There's no other choice.
From this I think it follows that as long as the spell on a scroll takes an action to cast, then it can be case as a bonus action using fast hands.
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