I think the safety in using the ruck loophole is in having only 2 players on-field. Use one non-playing ruck for the emergency and the other either may have already played or is unlikely to be a late out.
With the mids there is always a chance of a late out as you need to have 7 on-field with the 8th for the loophole. If one is a late out then you need to put the "e" on 2 bench mids. All right if you take it from the rucks where 2 have already played but still....
With the mids there is always a chance of a late out as you need to have 7 on-field with the 8th for the loophole. If one is a late out then you need to put the "e" on 2 bench mids. All right if you take it from the rucks where 2 have already played but still....