Ok, what you are describing is exactly the conclusion that I came to. I need to get the Samsung 34" off the laptop and onto the dock. In my haste however I picked up a 4k HDMI extension for the Samsung 34", leaving the smaller monitor connected as it is currently. I may reconsider this by doing your suggested switch-a-roo.
I also found the Plugable post describing the a/b switch. My only concern with that is the Surface dock is USB-C, and I believe the FAQ on that page informs that the USB-C is not supported.
I submitted a comment on that post asking about it. If you know anything, let me know.
Thanks!
Wayne
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