Yes, I'm playing solo Cleric/Ranger who is never using any summons - not from items not from spells. Except insect summoning spells.
Improved haste with loooong duration can be used from Improved Cloak of Protection +2. It is not from Item Upgrade mod but original TOB item.
Cespenar can make it from Cloak of Protection +2, scroll of Improved Haste and scroll of invisibility.
Since it cannot be used with enchanted armor, I take armor off, change cloaks, use Improved haste, put back Cloak of Balduran and armor and enter the room.
Not too cheesy I think. [img]smile.gif[/img]
You can check previous adventure of Aragorn in SOA forum.