Haemonculus Conversions

So looking to add a second haemonculus to my army so I can start running a coven battalion. However, having a duplicate of the haemonculus model does not sit well with me, so I'm looking for some alternative ideas. I've seen some pretty good one with idoneth deepkin heroes, but I'd love to see any other ideas people have.

Also nothing against third party models, but my DE army is the one I typically take to tournaments so I'm staying strictly GW.

I've seen a few good conversions using a tech priest dominus, chop off a few bits, add some spare talos or wrack parts...