Hi @Seth.I.D. 

unfortunately your approach will not help you for building the requested reports. You will need an individual table with two reference columns: Template & Incident.

As such a table is a typical M2M table you can create it without charging your custom tables as M2M a free.

To learn more about M2M tables I recommend watching the following video: https://www.youtube.com/watch?v=p6qcJO76eC4&list=PLkGSnjw5y2U5jTsF7i2yRZPdk3lm88SN8&index=24

Kind regards
Maik