Hypothetically speaking, what number of Greater Essences would I need to:

~Trade in for a Greensteel Blank? (Khopesh/Greataxe or Armor)
~Epic Scrolls? (preferably Chrono/Fens like ones.)
~Large Shroud Ingredients?
~Flawless Scales?


I know what each essence costs individually, more so interested to find out if it's even reasonable to trade those two items. Thanks in advance!