Would it be at all economical to combine the sword and the Shapeshifting? Maybe make the Sword a IoP that unlocks the Shapeshifting, along with making the various physical abilities into Modulars?
This would let you wrap all your current powers into one. tying them to the sword would cover the cost of modular abilities because it would give you a +2 Iop bonus.
Here's two thoughts:
1. If it's tied to the sword, Shapeshifting can represent the abilities of some of the former owners of the sword - your descendants. Maybe one was a gun nut, which would give you the justification to put guns up. Maybe one was an assassin, and you can tap into the memories and boost your stealth etc...
2. Make shapeshifting separate from the sword so that it makes you more rounded. Make it an Outsider power.
- Need to be sneaky?
Shapeshift into an amorphous cloud of void, allowing you to slip easily into houses and past wary guards: represented by boosting burglary and Stealth.
-Need to lift a giant boulder and block an entrance? Morph into a multi-tentacled mass of muscle: boosting Might and Athletics
-Need to outrun that nasty opponent? Grow several sets of tentacled legs and bound easily through all obstacles: boosting Athletics and Endurance
-Need to survive under water? Outsiders don't need to breath: boost endurance.
Also, the Void could eat/absorb the echoes of reality.
-You find a nice gun and want to shoot it. Eat the echoes of previous owners (or eat the gun's "purpose"), gaining access to the ability to fire the gun. (you might get a compel to have the item destroyed when you're done with it.)
You'd still be a great sword fighter, but now you can do lots of other things as well. And you won't need to take Modular abilities.