TL;DR: What XML snippets do I add to my TemplateInfo.plist files, to create a second compiler target when creating a new Xcode project?
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If I understand your question correctly...
To duplicate the Build Target automatically without manually creating a new one and setting it up select the one you want to duplicate and press CMD+D
(Instructions on how to do the same things but with (the more likely) build schemes (for future users who wonder to this question) are below:
In xCode click Product (top bar... across from File, Edit, View, etc.) and then at the bottom of the drop-down menu click "New Scheme".
To duplicate your scheme (like you suggested) click "Edit Scheme" instead of "New Scheme" then click "Duplicate Scheme"