Bluetooth support for TV boxes without BT chip? - Android Stick & Console AMLogic based Computers

I successfully tested several different ROM's on my X96 that on their original hardware would support BT.
Usually the combined WiFI/Bt chips that we find on the S912 boxes and some weird S905 ones.
Since my box does not have any BT capabilities through the hardware I was wondering what would be involved to find a BT stick that actually works on Android and to implement that into a firmware with support for a different BT chip.
I am quite new to the rom cooking stuff and still can't my head around linux thanks to growing up with Windows.
But my thought were somehow like this:
Take a firmware with BT support as a starting point.
Replace the WiFi driver with the match for the box - already done that and works fine.
Do the same with the BT driver - in theory easy too but where to find a driver or the correct libraries to make it work?
All I found so far in terms of poking around in the kernel is that there is nothing for the WiFi or BT in it.
Replace the WiFi folder in the system partition and the stuff just works, well apart from the usual hickups and problems with the framework and ui due to the different hardware.
So in my simple mind I think it should be quite possible to get a BT stick working on our non-BT boxes?

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i have buyed a simple Bluetooth Transmitter to connect a Bluetooth Speaker or Headset. Have received for 10€ by Ebay
its just Audio but now i can hear Music in my Garden without cable
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