Edit: Kudos to Piercy who apparently came up with the same idea some hours early and also got a comment by CM Seawolf
Regarding the new server region "EU West"
While deploying the new server region “Eu West” is a step in the right direction and will enable more players to enjoy the game, it most certainly won’t decrease the player numbers on the biggest servers to a reasonable amount. By reasonable amount I don’t mean that there won’t be any que times during prime time, but that you have to wait less than an hour (currently you can expect to wait for more than 4h30 if you que up at 16:00 on Asta).
Reasons why the new server region won’t drastically improve the situation
Biggest server load and que times are on the “fouderspack” servers. While the new server region will grant some compensation for moving, the majority who claimed their packs will lose money and are therefore very likely to stay in EU Central, leading to no major improvements.
The Solution - Launching EU West with a mirror image
In simple words: Create an identical copy of the current servers
While I do not know anything about the specific setups on the Lost Ark servers, beeing able to create a copy or load a older version of their server images should definitely be a thing (every sane company implements a way to create and load a back up of their servers in case some unpredictable events lead to data loss). So on a technical level it should be possible to build up the new server region and deploy said copy before launching the servers to the players.
Why is it the solution?
With no loss in progress or in money, there is no reason for players to stay on overloaded servers with long que times. The player base distribution will average out between the two server regions and secure population on both regions in the long term.
From an economical point the duplication should not have any impact, since the server are stated to be sepertaed from each other and therefore ressources cannot be exploited.
To prevent servers from running out of character slots, it could be considered to delete characters or accounts which have been inactive for ‘x’ months after the migration.
If I missed some important reason why you would not be satisfied with this solution, please leave a comment, and we might work this out