If you don't want to use the built-in WiFi and BT solution, you can (1) disconnect the antenna leads and (2) disable the feature in the BIOS.
I am retired now and thus no longer in the decision loop, but I can tell you that you are in a very small minority; the vast majority want the Intel solution built-in. I rather doubt you will see them remove the solution - but I will pass on the sentiment...
Unfortunately that is not good enough if you want to use the hardware in a for example physical location where wireless features are prohibited.
The only accepted solution is that the wireless features are physically removed from the device (the device itself will of course be shielded as an additional safety measurement).
I have nothing against that NUC's comes with BT/WIFI/WIDI cards included and "built in", what I am against is that these are soldered down onto the motherboard making it useless to use Intel NUC's in such enivornments where wireless features are strictly prohibited (where older NUCs could be used because you could then simply just remove the wireless cards from the device).
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I’m sorry, at this point, that will be the only option to disable it in the BIOS, and I understand that you would like the wireless to be removable and it is understandable for the environment where you work with the units, but unfortunately right now there is no plans from Intel or any information available if Intel will be considering this option.