If I understand your #2 question correctly; if you assign the VLANs to up-links in the "LAN Up-link Manager", will it be disruptive?
I performed this in recent times on 2.2(6e) without any kind of issue. Of course your environment is not mine so your mileage may vary. Mine was relatively idle during the change an had few vNICs and VLANs.
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