You could create your templates in your after startup microflow (after checking they don't exist yet).
So, say you have an ASu_All flow, add a subflow in which you:
- Do a retrieve from database with the name of your template to see if it already exists
- If it already exists, exit the subflow
- If it does not exist yet, create a new Template object with all the details you would normally fill out on the ExcelImportOverview page. Do not forget to commit it somewhere in your after startup
This should ensure that the template always exists in your database, no matter which environment you deploy it to.