You can use the 32 bytes hex for now. To create a nsec we need to make some changes but only available on edge release.
nostr:npub1az9xj85cmxv8e9j9y80lvqp97crsqdu2fpu3srwthd99qfu9qsgstam8y8 What about a "Nostr nsec" option for BIP85 menu? It could also show you which is the corresponding npub to crosscheck it in the client.
Discussion
Yes, this is what I did here in this other note. Works great! Just thought that being able to see the npub would help making sure everything went right. Cool for edge!
npub are created the same way Taproot addresses are generated.