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I’m afraid it doesn’t quite work like that. The Wifi and Bluetooth are provided by the same single M.2 card. Although you indeed can swap the card, if you find something else to use (and not all M.2s are compatible). The sizes on the image seem to be of microchips (not whole cards; see “product image”), which can not be swapped. And like Mladen says on the screen capture, Purism doesn’t do that kind of customization. For BT5 we just have to wait and see if a suitable M.2 card with an appropriate chip appears in the future - and that someone makes linux drivers for it too.
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I think someone who has Dogwood may have mentioned connecting wireless headphones, but right now I can’t remember where I saw that (or if I’m imagining). However, technically BT should be backwards compatible, so it would be surpricing if yours would not work. On the driver side there might be still some work needed (or was that just about voice in call? see this thread for notes on experiences) but that may be fixed by the time Evergreen comes out.
All in all, you’d have easier (and probably cheaper and faster) time getting new BT headphones that work on BT4 than getting a new card if by chance your headphones wouldn’t work. I’d hold on until you get to test them with your phone (and because there is also this comment that hasn’t yet been verified).