You know your work's worth, the users don't know yet. OP simply wants to know more about your product before willing to put in the time and effort for registering.
If you want to avoid plastic, Hario Switch is a great alternative. It allows you to steep and release, kinda similar to AeroPress (pressure only comes from gravity though).
Cone is made of glass, stopper is from stainless steel, but the base is made of silicone. I imagine the hot water contact with the silicone will be a lot less compared to AeroPress.
If you get the size 03, you can more easily brew enough coffee for 2 people.
I have a pair of IEM with the usb-c converter attached most of the time for use with phones.
Give Truthear Hexa a try.