It is what it is...you are taking a chance in very cold weather with any bat. As for me, I still use composite, but will use one of the bats I dont care as much about.
I have seen bats break at 12u. I know plenty of 14u girls that swing hard enough agaimst the right pitcher to break a bat. I have a pyroflyte warmer that dd uses in early spring late fall.
I do not know anything about this bat and DD hasn’t hit it yet but I got her one of these for a cage/ cold weather bat: Louisville Slugger 2010 TPS H2 Hybrid Fastpitch Bat.
Where the ball hits the bat is aluminum but the handle part is composite, I might over think things.
The only thing the 60 degree thing does is keep you from using the bat as much as you should and helps the manufacturer cut down on a ton of possible returns. You are doing them a huge favor.