I built a capacitor plugin that integrates both NIP-55 and NIP-07, it still needs more testing but here it is:

https://github.com/chebizarro/nostr-signer-capacitor-plugin

nostr:note1x8q8egnd6lgq86ng8w7t4ltgp5wtw7gv49xq93fp2u0ennrt222s57gqj6