AirDrop requires a Broadcom Wifi / Bluetooth device such as the Dual Band Wireless Broadcom BCM94360NG M.2 WiFi Bluetooth Card 802.11ac. https://www.ebay.com/itm/283934768547
I replaced my Intel wifi with the BCM94360NG M.2 WiFi Bluetooth Card (no kexts required) and AirDrop works. Hope this is helpful.
Does your 3046 work in 4K? DisplayPort? I tested your EFI in a Dell Optiplex 7050 Micro i5-6500T 2.50GHz and was not successful. https://www.ebay.com/itm/195410360637