It's time for the crypto community to think about creating their own open source HW devices that can be assembled like a kit (hardware and software separately).
There are already a few hardware wallets and signing devices that you can assemble yourself. Maybe you are aware of dkbit98's thread with
open-source HWs. At the bottom of the OP, you can find links to several such devices. The biggest problem is with the individual hardware components that aren't always open-source. You can also 3D-print your own cases.
DIY Open Source Hardware wallets (signing devices) (only for advanced users):