Interesting, though I can't help think the need for a 'pull' shock could be offset be more favorable design geometry. In your paint sketch, it seems like that stubby tab sticking out below the shock is going to need to be incredibly beefy. Just eyeballing the lever arm ratio looks like 10:1, so if your cycle weighs a couple hundred pounds, half of that on the rear, 10:1 ratio, then that little stub needs to support about 1000 pounds force. ...and really needs to support a 1-time load several thousand pounds more than that so fatigue fracture doesn't come into play.
If you could somehow get the shock in compression on the top side (sort of the standard geometry), then at least all that force could be distributed back into the core of the frame which is generally the strongest part.