Yes you certainly can freeze to remove water and concentrate alcohol and sugars.
I personally think it is safer than a still, as it is near impossible to smell, and up here in North Dakota there are dang few folks walking around outside "sniffing" for illicit alcohol.
Just bottle to the shoulder in 2 liter pop bottles and let it age while your waiting for cold weather.
Wild Plum "Freeze Brandy" Yum.