Nip-46 is total retardation.

nostr:nprofile1qqs827g8dkd07zjvlhh60csytujgd3l9mz7x807xk3fewge7rwlukxgppemhxue69uhkummn9ekx7mp0qydhwumn8ghj7argv4nx7un9wd6zumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezumrpdejz7d9xcpk if Amber is written in Kotlin it's trivial to create a .deb package from the same source code using JDK. I get that nip-5...

Have you tried Clave as a signer?