If it were me then I would do as @deadpoetnsp mentioned and use the excellent List Shifter plugin, you would just use your trigger to BEGIN ITERATE and then in each Iterate workflow you’d add a Create a new thing… action (plus whatever else you want to do). You can even have an Iteration Complete workflow to run actions once all of the RG rows have been processed.
Now when the workflow runs it will create a new thing in the db for each row of your Repeating group and then optionally run workflow afterwards.
If you do use this plugin please make sure to throw a few $$$ Keith’s way (it is Karma-ware!!)