Hi there,
Thank you for contacting us regarding this. I have gone ahead and restored your Steam account so that you should be able to login and see your characters again. Can you please check this and let us know if you have any issues.
Also if you did want us to, we might be able to assign an email address and password to your account so that you would be able to log into the standalone client and the forums with your Steam account. We would just need to confirm that you do own your Steam account. If you do wish for this to be done you can send us a PM on the website using your Steam details to log in. There is a link to the right of the login page.
Just let us know in the PM what email address you would like to use.
You can send us the PM here:
https://www.pathofexile.com/private-messages/compose/to/Support
Also let us know if there is anything else we can help with.