I'm not overly concerned about security. This project is going to be in my house, so only I and family will have physical access, or be in close enough proximity to it to connect via bluetooth/usb.
I'm currently fiddling around with the usb otg ethernet gadget, so I've got my pi zero configured for that right now. When I get done experimenting with that, I'll be back to bluetooth, to try and get that working.
When I come back to bluetooth, that link looks like it might have some good pointers in it. Thank you