Hey @tomshwom! Thank you for taking the time to write this post. Have you by any chance ever had a look at the Digital Bitbox? I would be very interested to hear what you think about this device, especially since I just wrote a review of it. From what I can see this device is very secure if 2FA is enabled, since physical touch is required.

Still, I completely agree with your point about splitting up control of a wallet. Shouldn't this theoretically be possible already with current cryptographic methods anyway?