Symplifying expressions with exponentials inside square root

I have an expression $ $ \exp (i k x) \sqrt{y^2 \exp (-2 i k x)} $ $ When I put this in Mathematica and do FullSimplift, it gives

FullSimplify[Exp[I k x] Sqrt[Exp[-2 I k x] y^2]] 

The output is $ $ e^{i k x} \sqrt{y^2 e^{-2 i k x}} $ $ Even if I give all proper assumptions $ \{x,y, k\} \in \mathbb R$ and $ -\pi < k \leq \pi$ like this

FullSimplify[Exp[I k x] Sqrt[Exp[-2 I k x] y^2], {x, y, k} \[Element] Reals && -\[Pi] < k <= \[Pi]] 

The output comes as $ $ \left| y\right| e^{i k x} \sqrt{e^{-2 i k x}} $ $ But the exponentials should not be there anymore, the result should be only $ \left| y\right|$ .

What simplification or assumptions to make, to get the desired result?