TV as centre speaker with Sony HTK-215

Hi,

I'm hoping to use my Philips 32PF9886 as the centre speaker on my Sony surrond amp.
Problem is, the Sony has no RCA out for a centre speaker (it uses those silly plastic Sony-only plugs). The TV expects an RCA connector for the centre in.
I'm not holding out much hope of finding a lead with an RCA connector one end, and the Sony connector the other, but I don't mind soldering the Sony connector to an RCA lead with bare wire at one end. Do such things exist, and where could I find one?

If I can find or build a lead, would this work? I don't want to risk damaging the TV.

Thanks for any help!