Dual-wield crit Ice Nova for Scion?

My first Witch was a summoner, and I basically played that one to unlock Scion, which I like very much. But now I find myself in a predicament because none of the Scion builds really work for me. So I started playing Witch again and I like this build very much:

Question is, I don't really want to play a Witch a second time, so would this build be viable for Scion? I tried to adjust the skill tree to accommodate Scion, but I have no idea if I'm doing this right. Here's my modified tree:
Could someone help me ad give advice on this tree?

https://poebuilder.com/character/AAAAAgAAEZYOSF3yQsPfhAL-jDZzs_BrFedw1YnTcFJVS2HiJpUWv8HF7BiP-uv1ZJ3w1UlRiEKCHhSw2wtMLUT7O-OKKGQJEQ-smHRVXyo6WFXGg9v315uhj0YdFI5k96a2-qcIuJPr7tWBhW0k2JrgRZ1TUij6gsf56EGHtz7-Cti9MtFFR8Bm2fwJqsCan9_vfASzogCaO4Kb7TzVpuw4Jy-QVRo4BAdMs5eVUlM9X66zQZbQ9Qhnkzq9Jxg8Bx6VLiycBULyRaZXOuFN4_6PNZKWdLaG7SA8BZf08h25k8MJ

is better imo.

The 6% spell damage nodes at the scion start are absolutely terrible. Avoid getting those nodes at any cost. The build guide you linked has a fairly well optimized tree, so ideally you want to change it as little as possible. That being said, the best route out of the scion start in my eyes would be the mana and mana regen. If you start with the mana and mana regen nodes, you can unspec deep thoughts (mana nodes near the witch start). If you unspec deep thoughts and spec into the mana and mana regen as well as removing the flat energy shield and mana regen node at the witch start, you only increase the point cost of the build by one point while keeping the efficient pathing through the skill tree that the build guide had.

Thanks for the advice :D
The build looks now basically like the witch's one ^^