Basically you can ask 100s of people who no longer play NW to come in and play in 1v1s. You can effectively add everyone from the old 91st or the old old 92nd and ask them to play for you. No ex-NW player will turn down the chance to play once a week in NWL.
I think it should be active regimental members only. Not NWL jumpers. My opinion
So only active regimental members interesting concept, how are the referees and the Host going to decide which member is active enough to play in a NWL match or not?
Lets put it in perspective, RandomRegiment_RandomRank_Name sorry man you cant play in this event you wonder why ? well seeing you have a life besides NW and cant attend every event I am not allowed to let you play in NWL, sounds stupid does it not ?
In these kind of situations I suppose you have to put some trust in the regimental leaders, that they wont use invites and hide them as members, bring special recruited members into there own regiment to only attend a tournament like NWL, RGL or any other tournament for that matter.
If you really would like to discuss something then I would suggest start a topic called double reggers in a regiment that got accepted into NWL (but that as well seems like more of discussion to be decided by the Host)
in the end I would worry a lot more about tactics and trainings to prepare yourself for these kind of tournaments then to worry about someone who is using an member which could be considered as an inactive member that only shows up every now and then to an event when they have time.
Obviously this is my opinion and feel free to disagree with me, in the end you just have to wait and see what is to be done with all of this