My solution:
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I purchased the Broadcom BCM94360CD from Amazon and purchased an adapter from
http://www.osxwifi.com, they don't have them on the main page, but you can get one for $44.99 + $5.99. No soldering required.
Currently, I am using a USB Adapter Cable (USB 2.0, IDC 5 Male (single row) to USB A Male) on one of my front USB ports, for the USB data channels.
Once I have tested this a bit longer, I will tap into the old BT USB data channels as described by OP and Kennyman. I suppose that if you did not want to go the route of splicing cable, you could purchase a PCIE USB card with an internal USB plug. Also, I will route the BT antenna out of site.
I will post the final setup once I have some time to do so.
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Continuity/Handoff, Airdrop, Phone calls all work.
Specs:
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