I would wait for epic, and create myself a living vault, install phylactery within.
Alternatively, create an advanced golem with a phylactery within, [nicking idea] then cast imprisonment on golem [/nicking idea]. This way, even if some enemy manages to release it, they've got a golem to deal with.
Have an artificial eye as your phylactery.
Have your phylactery surgically implanted in a body cavity, disguised as an artificial organ from when you were alive or as part of one of your bones - who's really going to dig through a recently re-deceased lich looking for a phylactery and smashing everything just to be certain.