If you can get over the design, One More Try is a WebApp (sorry, mobile Safari) that automatically plays back a delayed recording of whatever you're practicing. And if you want to improve on that: Tom Lum open sourced it.
If you don't like how Facebook deals with Oculus Quest, you might consider building a VR headset yourself.
Laws of UX is a collection of principles that designers can consider when building user interfaces, created by Jon Yablonski.
For sustainable packaging, MetsäBoard has you covered with paperboard.
And if you want to avoid packaging completely, there's a map for that.