I pretty sure you can do this without a template and you will have much more control over it using custom module.
Create a new custom module at tiki-admin_modules.php#content_admin_modules1-2
Add your code (wiki syntax, html, jq, js, smarty, etc) and set where, how and who using the module parameters.
I would also consider using a tracker to store and manage the suggestions.
It will make everything simpler and the Tiki way.
You can then use tracker monitoring or notification (or plugin notification). Those will send automatically an email to address(es) when new item is created, form is sent, item is modified, etc.