That last drawing has it correct.
What I was getting at is at the button you don't have both the switched hot and the return.
Exactly where the wires make contact don't matter. But you want to keep the two (hot and return) too the 2nd bell together. This is not an electrical requirment (not at the voltage and current levels used for a door bell). But it gets very confusing to anybody that runs across this in the future is you have a single wire from the transformer to the button to the bell and to the transformer.
Now clearly those are at the orginal door bell. But depending on how wires are run it they might also be together at some common junction point near the transformer or some point in the attic or basement/crawlspace.
"Also would sending the 16v directly to the doorbell and using the switches as the return to the transformer work as well just flip flop the + and - as I now have them?"
That will work also. For low voltage transformer circuit (unlike 120 volt circuits) it does not matter which lead of the transformer the switch is in.
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