There's another signer in development now by nostr:nprofile1qqszjvsfwh0c2hlrffa5ttdzgg0zcaquxlqpx6gplerhzvafr6cckpcpp4mhxue69uhkummn9ekx7mqpzpmhxue69uhkummnw3ezuamfdejsz9rhwden5te0wfjkccte9ejxzmt4wvhxjmcp2f564 

 nostr:nevent1qqstzqwqt3vaxxqtumweueu2rgesd9fcqspk4yzvl7snnymr5x9mhzgpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsygpfxgyhthu9tl3557694k3yy83vwswr0sqndyqlu3m3xw53avvtqupsgqqqqqqs2m47vu 

 Thank you, adding.

To confirm, amber is also a nip-55 signer? 

 Yes