Are you sure you do not have a row of holes in the board or the 3 holes next to the CPU Daughter-board connector?OK, then I misunderstooded the posting
Removing the WiFi/BT Chip should be no problem, as it is only soldered with 7 pins (or maybe there are some more under the board?).
Next problem could be still the adapter. If there's also a rtl8723bu chipset, then the same error could happen. And for WiFi I need another adapter?
Soldering a BT-Only board there seems to be the only really confirmed solution...