The topic was discussed on IRC, it seems a better approach would be to keep using the keyring background key, just set it to whatever background is appropriate for the device on first boot (e.g we just need some snippet doing the ratio calculation and writting the key)
The topic was discussed on IRC, it seems a better approach would be to keep using the keyring background key, just set it to whatever background is appropriate for the device on first boot (e.g we just need some snippet doing the ratio calculation and writting the key)