|Tommi Ketonen Venture-Agent, Finland—Turku aka Tomppa|
Unfortunately, you can't take extra hex feat at level 1 if you don't have hex at level 1, because the prerequisite of extra hex feat is having the hex class feature, and you don't get that until level 2. Meaning that you'd need to retrain your first level feat choice as well, and you'd be left with just cackle.
Good news is that if you are retraining a feat at level 4, you can take any feat you qualified for at level 4 - it doesn't need to be a feat you qualified for at level 1. So you could take extra hex feat for misfortune, or evil eye. Problem is that retraining says:
"You may change one feat to another through retraining"
Many consider this to mean that you need to change it to a "different" feat and that Extra Hex (Evil Eye) and Extra Hex (Misfortune) are the same feat (Extra Hex) and not different feats (despite giving different hexes) so you may need to retrain extra hex first into something else, and then back into extra hex.
I don't think that's the intention, though, but you should check with your local VO on how to proceed.