It already works. Just use Amber sign on Android via NIP46 bunkers.
I want to rebrand nsecbunker as "sign-via-dm"
Nostr clients like amethyst by nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug and damus by nostr:nprofile1qqsr9cvzwc652r4m83d86ykplrnm9dg5gwdvzzn8ameanlvut35wy3gprpmhxue69uhhwetvvdhk6efwdehhxarj9emkjmn9qyxhwumn8ghj7mn0wvhxcmmvqyg8wumn8ghj7mn0wd68ytnhd9hx2yhtlun should implement it so that I can use desktop nostr apps without importing my privkey to a new app or extension. The desktop clients just "dm" my phone client with an event to sign and I approve it on my phone.
Let's make it happen!
Discussion
ππ₯
I don't see it in my app store search results. Do I have to sideload the app? Where can I get it? 
just download the apk
zap.store is the cypherpunk alternative to that
People helpfully provided links to Amber for me. But I'm confused. Why should I put my privkey in amber when I already have it in amethyst? Can you make *amethyst* an nsecbunker backend?
Then you can remove the key from amethyst and just use Amber as a signer for all apps.
How do I set up amethyst to use amber as a signer? I don't see an option for that in Settings
Figured it out, testing it now.
I downloaded amber and set that up, then logged out of my account on amethyst. Then on the login screen there was an option to log in with amber. So far it works great!