here ya go, not perfect. I tried with synfig but it tries to blend the pixels, not sure if it would match the rest of your stuff. I made it all with gimp, just moving and rotating layers, then using align to get the sheet right. First I broke each body part down, I included them to show you. I also edited the head a bit because the perspective you had was a bit off. Lastly there's some geds I made to test them moving.
I noticed a problem though when I made the geds that I suspected from the beginning. Your diagonal standing positions that I based this on are a bit off, they're facing slightly too far to the right or left and not up enough. So they'd actually move more to the side instead of moving equally on both axis. You'll notice in the first test ged, where they move more to the side, it looks more natural than the second test ged, where they move the same on each axis. Not too noticeable, but if you're a perfectionist it'll get to you lol.