here to show what this could look like if Epic TRing started you on the Heart of Wind - this lets you get more mileage from your Veteran I and Veteran II status. I still like the idea of this just to add value to these favour unlocks.
If you Epic TR as an Iconic class, you will pick up an Iconic Past Life Feat and an Epic Destiny Past Life Feat. If you Epic TR into an Iconic class, you will start at 15.
Starting at 20 would mean that you wouldn't be entitled to a Past Life Feat or an Iconic Past Life Feat because you've not given anything up to receive it. If you're really only interested in the Epic Destiny Past Life Feats then Epic TRing into an Iconic is your best bet.