Is the template you're using an editable template? Because if so, you can simply edit the template itself to allow components to be added

Probably because AEM doesn't know which components to allow on your parsys. Please check the following links on how to do it in design mode and how to do it in xml format in the design of your projectConfiguring Components in Design Mode cq5 - Restrict the components in AEM 5.6.1 - Stack Overflow

It will not delete the node and create a new one. If it already exists, then the content is updated and a new version is created.

The downside is that you can never really know if the content that is behind your link is actually available. Maybe vanity URL's can check it for you, or you can use a Transformer ( Apache Sling :: Output Rewriting Pipelines (org.apache.sling.rewriter​ ) to transform your normal URL's from the page ...

Then you should create a new maven profile that will push it whenever you've installed the package in your local maven repository and run without the autoInstallPackage(Publish) profile, but with your new created profile.