This defeats the whole point of NIP57 or other key segregation methods.
Sharing the key with the client is no different than exposing the keys in a different manner 🤦♂️
If you are going to use a HW, have it sign a parent key for delegation.
Discussion
When NIP-26 delegation is possible in more clients we'll have support ready for that.
Key delegation is obviously the end-goal here 🙂
For that you need to implement frost.
