Just throwing this idea out there, I have this idea about an extra wide hammock with an strap (adjustable?) running lengthways underneath that would allow the centre of the hammock to be raised to give a W profile. the centre of the W wouldnt need to be as high as the sides just high enough to keep the two channels.
My second thought on this, to take into consideration lying on the diag, would be a very wide hammock, lots of sag and the strap attached to the ridgeline towards each end so that the strap kind of corckscrews. It might mean head to foot sharing though.
If anybody thinks this might be a viable option and gets one made, please send the pictures to my ex-girlfriend who saw my interest in hammocks as evidence that i didnt want to be close to her anymore