Create recurring tasks pre-populated with sub-tasks/checklists

I think that's exactly what Blueprints offer, no?

Or can you not automatically recur them? And I guess you've tried recurring tasks which have subtasks? (they don't carry over the subtasks?)

I checked out the Blueprints solution but that doesn't seem to do this.  Recurring tasks that have subtasks don't spawn to the new recurrence with the subtasks, only the initial creation of the recurring tasks contains the subtasks.  Example:   Recurring task spawns monthly for, say a reminder to check on 5 subtasks, each subtask assigned to a different person and setting the main task to end of month with subtasks having their own dates such as week 1, week 2 of the month and so on.