Interesting. I was unaware that Yakihonne had their own lightning wallet.
nostr:nprofile1qywhwumn8ghj7mn0wd68ytnjda3kket5dehkgefwwdcxzcm99uq3jamnwvaz7tmjv4kxz7fwd4hhxarj9ec82c30y5erqqg4waehxw309aex2mrp0yhxgctdw4eju6t09uq3jamnwvaz7tmwdaehgu3wvdshymr0wd6xkepwvd5z7qgnwaehxw309ac82unsd3jhqct89ejhxtcpzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtcppamhxue69uhhy6m8dvhx6mm99uqzpu40g585yw4jszly54t2p4qpehpsvyl7mtlrddudmcl0jtcdde63k4ws38 in the above setup, Yakihonne would replace CoinOS. I don't know anything about Yakihonne's wallet, though, so I can't speak to which is better.
I cannot stress enough that you should NOT follow instructions 1-3, though. Don't paste your nsec into clients. Use a signing extension like Alby or Nos2x for that.