And in terms of code style, I would avoid this - I would set up the Target1/Reference1 mechanism as I described it, using either the Target1 or the user's choice to set a focus, and then doing everything else with that drop-down based on the focus. Trusted scripts are something I think should be avoided if there's a way around it, because you can overwrite what the user set, with no record of what they did originally set, in case your newly added thing was a mis-click.
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