While portals are limited in W&W - you can make good use of what you can do with them. Bungleau's suggestion makes the best use of putting a portal inside Dragon Spire - if you're pretty much done with the Ishad N'Ha area and aren't worried about your available portals - put one outside the Dragon Spire on the ramp leading down to Brimloch Roon.
You can also stack Stoned Monsters to make yourself a ladder up the side of the mountain to the ramp. That's more fun than going through Dragon Spire again!
Wyv