It's correct that you cannot file a PCT application based on your US application anymore. However, reading for example art. 54 of the European Patent Convention
An invention shall be considered to be new if it does not form part of the state of the art.
The state of the art shall be held to comprise everything made available to the public by means of a written or oral description, by use, or in any other way, before the date of filing of the European patent application.
Additionally, the content of European patent applications as filed, the dates of filing of which are prior to the date referred to in paragraph 2 and which were published on or after that date, shall be considered as comprised in the state of the art.
IF there are no publications of your invention till today and your US application hasn't published early, there is, as far as I know, nothing impeding you from filing a European patent application and your US application will not be prior art.
However, I'm not sure when your non. provisional will be / has been published because it issued. Might be soon?
Another thing, european patent applications require a patent attorney for foreign applicants for basically every action apart from filing, so you'll need an attorney anyways and might as well ask them then.