The custom appel header does pci-e + usb signals, so it won't ever do the bluetooth part.
I know this card very well and in fact I've had it for over 2 months now, and you can get it to work by using the external header and put that back in your backpanel of the pro.
The bluetooth part really is worth it though, with antenna the range and responsiveness is far better than the stock bluetooth from your mac pro (using a Mac Pro4,1 myself).
The price is a bit steep (mine came at 110 euro ~ 140 USD), I'd rather have a mini pci-e card for my hack next.
Also bluetooth 4.0 is pretty easy to get working today with several usb bluetooth sticks from ebay, as low as 4 USD including wake from sleep support.
That said it's probably not worth your trouble, I know I'll be selling mine at some point.