So I figured it out. The best option seems to be connecting coinos via nwc to Amethyst and then optionally connecting it with Alby Go wallet to have nice mobile wallet.

Here's how:

You get nostr:nprofile1qqst4qyeqenw7zm0fwjsty68h6cnys5jre2xd8ngqpjv5a2j26s78fspzemhxue69uhhyetvv9ujucm0d9hx7uewd9hj75a0pev account and copy the connection string (see screenshot) and then in #Amethyst you hold the lightning symbol under any post and then you press the "paste" button (see the second screenshot) and that's all you need. For extra points you can install Alby Go wallet and connect it with coinos using the same string. This gives you better experience than the standard web coinos.io version.