I am the new member of the month baby, and I had to post this.
So It breaks my heart to hear Accountkit didn’t work natively with expo and unless you detach it.
Fear not there is a way.
I basically created a webpage which hosts a web version of accountkit. Host it on your server.!
https://gist.github.com/xpsdeset/72a0ca5b774dfdbc8f60d45dbf379967
The live preview of that gist can be seen here
https://rawgit.com/xpsdeset/72a0ca5b774dfdbc8f60d45dbf379967/raw/5e538c496e3658b6618029aa8d4c29fc087f55f5/AccountKit.html
And a working version of accountkit with expo can be seen here
https://snack.expo.io/HJFK20QwG
Make sure to whitelist your host/domain as seen in the screenshot. I assume this is the same way how some payment gateways work via webview but act as a part of your application.
Did I mention I love expo.