MikeLemon:
I need the NRF5 in specific because you can program it easily
Really? It doesn't sound like it. Indeed, quite the opposite - hence your plaintive wish to have it work like an HC-05
and implement along the bluetooth other stuff,
What "other bluetooth stuff"? If you are referring to anything other than plain vanilla BT2 SPP protocol, then you have just left HC-05, and bought a passage into another world, where it is time to come to terms with the programming adventure that entails.
Any way, are you sure there is no way to make the connection more secure with something like a pin code or a password before you connect to it?
No. This is bluetooth. It is a system more for convenience than high security, but the security it has should be quite satisfactory for normal people. If you are getting paranoid, moving to BLE might help somewhat, as I understand they all use a six-digit password for pairing.