Thanks for contacting us.
You can try to achieve your goal with a custom plugin. Following this link
you can find a few suggestions. I find the first one pretty maintained. How to use a custom plugin you can find here
Yes, you can change your app identifier as long as it meets the requirements listed here
Please, do not hesitate to contact us if you have any further questions or need of assistance.
Share what you think about AppBuilder and Telerik Platform with us in our feedback portal, so we can become even better!