After thinking about it, this seems would be the preferred option for me. I'll explain how I can see this working.
From what I can tell, the feat stacks on itself, but also there appears to be a slightly higher increase on the third/final feat. So how about:
* The first time you Epic TR a ED, you get a feat that starts at level 1. This feat could be called the Epic Past Life Feat (Heroic).
* The Second time you Epic TR a ED, you get another feat that applies at level 10 and stacks with the first feat. This feat could be called the Epic Past Life Feat (Paragon), since this is the level that Paragon weapons start sprouting up in the game. This feat also has double or more the power of the Heroic feat.
* The Third (final) time you Epic TR a ED, you get another feat at level 20 that stacks with other two feats. This feat could be called the Epic Past Life Feat (Epic). This will be the most powerful of the feats that will be, let's say triple the power of the previous two.
* The Toggle feats could either be frozen until you hit Epic or they could scale up as you level, like the above.