Sierra Apple Watch unlock w/ Mid 2012 MacBook Pro (How to/Help)

PCtoMAC1

macrumors 6502
The "merged" unlock thread seems to be geared to those with 2013+ compatible Mac's. I think it would be beneficial to start a thread for folks that have an Apple Watch, are running Sierra and have a MacBook Pro with low energy Bluetooth but are unable to use the feature.

I'll start with what I have:
1.) Mid-2012 15" MacBook Pro with Sierra that has low energy Bluetooth.
2.) Apple Watch Series 2 running 3.0.
3.) Two factor authentication on all iOS devices.

What do else do I need? I've read that I need a new internal AC wifi card for my MacBook.
1.) Is that accurate?
If so, where can I find one and are they easy to install?
2.) Will installing the card increase my wifi speed or will I still be limited to what my MacBook came installed with?
3.) Will installing the card cause any internal issues with my trusty machine?

Are the options that are available from the App Store just as good? Do they do the same thing or are there more steps involved?

Thanks!
 
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