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Bluetooth Priority pairing for tesla vs car stereo

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Any BT stack experts out there??
I have a 2016 refresh with std audio and recently did a complete aftermarket stereo replacement separate from the tesla system. The tesla system still plays thru the rear door speakers but the entire front stage was replaced with aftermarket components with 96K bluetooth input from phone.

The telsa system still plays through a high level input off the front speakers and thru the aftermarket system but i rarely use it due the poor audio quality.
My question is that the car and the aftermarket system are still in my bluetooth connections on my phone, but the Tesla seems to take priority whenever the phone sees it. Cant figure out how to insure that the aftermarket system takes priority (vs tesla BT) even if I forget both systems and repair the aftermarket system first it still will pick tesla every time. I would like to keep tesla BT connection for track control and BT phone connection.