Before upgrading, do the following:
(1) Update to latest Clover
(2) Upgrade kexts you're currently using found under /EFI/CLOVER/kexts/Other/ and kexts you have installed to /L/E or /S/L/E
Common links for new kexts:
https://github.com/vit9696/Lilu/releases
https://github.com/vit9696/Lilu/blob/master/KnownPlugins.md
https://bitbucket.org/RehabMan/
(3) Make sure it's still bootable after the above 2 updates
As for Bluetooth, you'll have to found out what you have and if it's compatible to MacOS from vendor's website.
Sorry, I have no experience with USB Bluetooth dongle.