Faced similar situation today, here is the solution for the problem.
Assign a group to the recipients, add an extra column to the recipients excel which contains the group. Now While importing those recipients by recipient import wizard label it as group. Now in the Task--> recipient add the group instead of individual recipients. That's it.
When ever there is change in Excel containing the recipients list those will be automatically updated in the NSQ recipient list and further that will get updated in Task-->Distribution List as we are using the group here.