This going to be so hard to manage.If you go along the route of "a select amount of servers".
1. Guessing that the Iron Europe Team would be funding the servers and taking the cost of a 200 player server at $20-$25. IE would be paying for 8-12* servers. This would be in the region of $200-$250 a month. Hardly something that IE would be willing to pay as I don't believe they would get it in donations. No offence to your wealth IE, you may be very wealthy and willing to pay for all I know. I am just assuming.
2. Regiments would have to either train alongside each other or regiments would have to book time slots in which they could train. Firstly regiments enjoy the independence they get with their own server and may not want to train with other regiments. Secondly organising a schedule will be incredibly difficult to manage from a admin point of view. As at the beginning there will be so many regiments booking places. + These regiments will only be 3 man regs run by a 15 year old that will disband in 9 days meaning that those spaces on the schedule will have been wasted blocking a serious long term member of the community from getting a place, denying them from a successful start-up to their reg.
3. It makes it incredibly hard for people off the forum to create regiments as they can not access a place to train, or they could just train on another mod but its not the same thing if you get me.
*Imagine, 1 EU Battle, 1 NA Battle, 1 EU Siege, 1 or 2 EU Training Servers, 1 or 2 NA Training Servers, 2 NA Event Servers, 2 EU event Servers. + Possibly Team Deathmatch Servers, A siege for NA servers. It is worth point out that siege might not be played in IE, but who knows
As an alternative, you could just start off and say IE will only have 15 servers. Have 2 Official servers and the rest are regiment, joint regiment. Server files would be let out to regiments or groups of regiments that are deemed trustworthy or respectable. But that could lead to an outbreak of the server files being spread around the community. Iron Europe could similary just set up 20 servers and give bidding regiments the admin to the servers and the server becomes theirs, the regiments paying IE for them of course and then IE paying the server hosts.
^ However this has major downsides.
This is a double edged sword with negatives on both sides, but tbh we truly don't know what will happen with the "select amount of servers" as it has never been done before. I guess you could just YOLO.