More stable Amber support for NIP-46  nostr:nprofile1qqs827g8dkd07zjvlhh60csytujgd3l9mz7x807xk3fewge7rwlukxgpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszrnhwden5te0dehhxtnvdakz7qgswaehxw309ahx7um5wghx6mmd9usjfpck and a desktop signer to do the same. 

 I have plans to make it multiplatform but haven't started working on it yet 

 I am not sure if it's a good use of your time.

But if you want...  

 Nsec.app has self-hosted mode (that nobody tried, obviously), need to wrap it with some cross-platform app framework to make a desktop app.