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
I tried using this EFI for my Dell Optiplex 3046MFF
Also modified config.plist in PlatformInfo but got no success.
I followed Dortania guide but still not working
Issues (on my side):
After booting to Flashdrive, I only got blackscreen.
Tried modifying the EFI, got Kernel Panic
Another modification, the progress bar came until on the middle and got error
PC SPECS:
Dell Optiplex 3046M
i5-6500T @ 2.50Ghz
Intel UHD 530 Graphics
16GB RAM
Only Ethernet (I don't have network card)
Using 2 Monitors (VGA + HDMI)