X220 Tablet Bluetooth PCI Express Card

[X-Man]

Am starting to get much more use out of my X220T, but was somewhat puzzled to see it does not have bluetooth.

So am looking at options and thought the best thing is to find a PCI Express Card to conserve scarce USB ports.

Have a WAN card installed currently that I don't use at present, but imagine it is also possible to get a wi-fi card with bluetooth functionality to replace the one in the other slot

Are these subject to a whitelist, or can I pretty much use any card i can find? Any specific recommendations, chipsets, etc?

Many thanks!