I don't understand roots of the problem, that developers are forcing on players to deal with.
No matter how you look at it, the solution is so simple, that it hurts.
If the economy difference between servers is the problem, then the zeny of Freyja server should be converted into tradable gathering/crafting materials based on: a) average server market prices; highest level character on the account on Freyja. The items should be distributed using Temporary Box Storage (with unlimited withdraw duration, because many players may not know of the server merge and to prevent the loss of their converted zeny), since they are tradable anyway.
It may look same, as cutting zeny to 2%, but in fact it is completely different.
I had a good enough idea for the zeny problem, wich was keeping the quests zeny intact, coz when u are lvl 50 u have like 1500 z if u did all the quests but it seems like no one cared about it xD also after reading some of the forums I noticed that most of Freja players didn't even care about this issue so I just gave up :/