I don't know how to do a git PR but you can build your own Blockstream Jade signer:
https://github.com/Blockstream/Jade
This is a guide:
https://www.youtube.com/watch?v=PeqP6oVnlIs
more guides also:
https://bitcointalk.org/index.php?topic=5454770.0
Also related: blockstream satellite builds (I cannot tell if the hardware is proprietary or not and I wasn't able to find a diy schematic):
https://github.com/Blockstream/satellite
I don't know how to do a git PR but you can build your own Blockstream Jade signer:
https://github.com/Blockstream/Jade
This is a guide:
https://www.youtube.com/watch?v=PeqP6oVnlIs
more guides also:
https://bitcointalk.org/index.php?topic=5454770.0
Also related: blockstream satellite builds (I cannot tell if the hardware is proprietary or not and I wasn't able to find a diy schematic):
https://github.com/Blockstream/satellite