I would also love to play with an Wavien collar but they are just crazy expensive 
But you looks to be a handy guy & you can design stuff in 3D, maybe you can get something fabricated that works just as good. Check out borg’s post #51 in this thread
And comfychair made one also, unfortunately he seems missing from BLF for quite a while & all his pictures is off line, from this thread from post #6