Accessing certain Ziost areas

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Once you complete the Ziost story line you are left with this gray area of doom and a few dailies but no clear way to see the rest of Ziost ever again.
As the gray area is boring me and I am missing one walker for the achievement, I would like to go back the the pre-doom Ziost.
Is there any way to do this with my current character? I only have 2 characters past level 55 and one is just for PvP, so building up a new character to the Ziost storyline would take effort for me.
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SWTOR -- Imperial Agent Storyline: Makeb, Manaan, Rishi, Yavin 4, Ziost
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Images: sergio souza, Curtis Adams, Ollie Craig, Erik Mclean