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As per Microsoft supported option, you can follow below article and use site definitions instead of site template.
"saving publishing enabled sites as a template is not supported and it does not work. You cannot use this option to create new sites. Instead you should create site definitions (..\web server extensions\12\template\SiteTemplates) and provision ...
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No need to use custom code or javascript as you can take advantage of OOTB functionality in SharePoint.
According to my understanding you are looking for Item-Level Permissions.
Below is a good article on how to enable item level permissions in SharePoint. maybe it will help you with your requirements.
How to enable Item Level Permissions in SharePoint.
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This is not really possible using javascript. User will be able to go to the list url directly create their own view and be able to edit it.
You have 2 options:
A. Use custom permission (using some wf/flow you could trigger it automatically upon creation and grant only the edit rights) but having list with custom permission has its performance drawbacks. ...
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