It would be easier to disable the SDIO/BT module through device-tree changes (disable the sdio node, disable the BT node)...
Probably impossible for the thread starter, and needs further explanations.
...than to physically modify the board by unsoldering chips, although that could also be done if you have the tools/skills.
Doable for beginners, but it needs a heat gun, and watching a YT tutorial. However, I would start with the WiFi antenna, and see what the results are.