I would like to answer you...But i find I have to ask questions rather than answer...
Why would you being wanting to roast wings and breasts? A whole bird I understand. But wings and breasts can be done better on a burner (your stove top). Sure, wings might take a little longer because they don't lay flat...But a breast lays flat and only takes a few minutes. By the time your oven heats up, you could have it all done in a pan on the stove top!
Any way, whatever reason...Why not put pen to paper and design the thing yourself? Then you could sell it on one of those midnight infomercial shows for $69.95...Wow, if you sold 2 mil in the first year (which is realistic) at 10%...you do the math!...But I expect 5% for giving you the idea!
Really though...Just put some foil over the wings. If you really need or want air flow, then just leave one or two corners of the foil up a little. You can even just sort of scrunch a sheet of foil and just lay it on top.
If you realy want or need a mesh type system, you can use one of those pastry rollers. Yeah, I am qualified and all, but it don't mean I remember everything!!! so I don't remember what it's called...You can Google for it. It's a roller for making little holes in pastry. Roll it over a sheet of foil several times and bingo one oven ready splatter guard!
Now lets talk about the infomercial....
EDIT: Sorry, I see you said thighs, not wings...same, same.