At all, if Double regging Is good or not, you wouldnt be able to realise your plan. We have 14 Regiments with each Let's take the minimum 15 participating Members. Makes 210 Members, Where you Would have to Check. If you Want to do that, much fun with that. Attending at 2 RGL-Regiments: Definitely no, being at a RGL-Reg and another: clearly yes. The Morale aspect Is up to the Players or leaders at all, not to any League.
Have there Been Problems with that at any NWL? As far As I Know not.