Echo Frames live in the audio-glasses lane, not the display-glasses lane. That simplifies the accessory question. You are usually deciding between better fit, safer carry, and easier daily handling, not blockers and projected-display fixes.
What makes sense first
SGG GRIP helps if the frame still moves too much. SGG HANG helps when you are constantly taking the glasses on and off and need a cleaner resting spot. SGG VAULT matters when the device travels in a bag and needs more protection than a soft pouch.
What does not belong here
Display blockers, frame-specific glare parts, and other projected-image accessories do not solve Echo Frames problems. This is why audio-first smart glasses should be treated as a different accessory lane instead of a smaller version of AR display glasses.
The clean Echo Frames order is fit first if the frame moves, carry first if the routine is messy, and storage first if the protection gap is obvious. Keep it simple.