Permanency via Use Magic Device

[Killer Angel]

You can only cast Permanency on spells you cast yourself.

Indeed. Permanency's text is:

You cast the desired spell and then follow it with the permanency spell.

Some sources (such a Wand) are valid for the purpose:

Activation
Wands use the spell trigger activation method, so casting a spell from a wand is usually a standard action that doesn’t provoke attacks of opportunity.