Umm. not sure if it is the right size or not, since you are dropping TWO levels, not one, but, estimating lorien at 60 and mirkwood at 65 are both going to around supreme ( tier 6 ) level, then moria/eregion, at 50-odd OUGHT to be the size you want.
If that IS right, then I would go for eregion, easy to sweep all those half-orc ruins there for scholar caches, once you have them greyed out.
Ancient Vase (from Lotro-wiki)
They can be found in ruins throughout the Misty Mountains and Eregion and can be tracked by scholars. They contain Tier 5 scholar materials.