Is there a tool that will crimp close the end the ribs on a metal roofing panels?
Commercial standing seam roofs are systems. Very often they are fabricated with dedicated digitally controlled equipment from engineered design drawings. Eaves, soffits, and drips are likewise designed and shop fabricated. In the field, seaming is typically done with purpose specific tools.

All of which is a round about way of bringing home the idea that the infrastructure is outside the budget of most homeowners [as well as a great many residential tradespersons] and that off the shelf parts aren't readily available. Thus, it's not really a DIY sort of project for even the  skilled.