Def. use the PeaPod or PolarPod with a Traveler or a hammock very similar to it--just to reinforce what has been said, the shallow nature of the Traveler will allow the Pod to lie on you removing the sizeable air space (that would need to be heated) that is created when using the more pronounced trough style hammocks.
Not that you will need more room for the diagonal lay but if you do or anyone else is compressing down or inadvertently opening the velcro study the MountainHardware Sleeping Bag Expander pictured below.
My 'normal' 30F PeaPod wasn't enough so a saint-Samaritan added 6oz of 900fp down to it and then I added the sleeping bag expander.
If you are wanting to avoid the issue of moisture inside the pod generated by completely velcroing yourself inside the pod, look at a JRB down hood--it mates perfectly with the velcro of the PeaPod....speaking of velcro and the sleeping bag expander-it comes with zipper-simply remove then and add velcro.
One reason I was compressing down in my pod system when going for the diagonal lay was because I was (and will continue when temps warrant) using a double pod system....the inner pod was/is a 20F Wallcreeper and the PeaPod the outer.
I also have the original Speer Pod rated at something (sorry can't remember the exact rating) like 45F (or was it 55F). It is sewn through construction and probably only intended for mild temps. I wonder how it would do as a comby with PeaPod or the PolarPod.....might have to experiment with that combo this winter.
Anyway congratulations on your pod!