KEF LS50 + Bluesound Powernode in a 4.0 setup (LSX as back speakers?)

[Baygon]

Hi,

I've just bought a brand new pair of LS50 Meta with a Bluesound Powernode, and that's such a blast that I want more!
I'm looking at making a 4.0 surround system but not necessarily have the budget for another LS50 pair + Powernode.
So I was thinking of the LSX as back speakers, but I understand the connectivity might be an issue.
Would it work with a Node? Or how would you suggest that I set this up?

Thanks guys