The answer is almost certainly yes. You could employ a userform to select the variations ane write them to various parts of the document, or as you have already gone to the trouble of creating the templates, you could add a ribbon tab to the ribbon with a menu system to call the required template.

Mail merge may create some issues in this context, but probably not insurmountable ones. We would need more information.

Start with http://www.gmayor.com/Userform.htm and http://www.gmayor.com/Userform_ComboBox.html

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com