Caution... I may step on some toes here, sorry.
I have used the old generic stick with a notch in the end about forever... Not really a good design. I'm making new ones now and trying to dump some of my old habits. I'm still quite strong but not quite as much as I was 10 years ago. I am also more absent minded than I used to be and more easily distracted... Hey look a shiny object...
I try to keep looking at everything I do all over the farm constantly to think if I am doing things the best (and safest) way. That is especially true of the horses. As I set up this woodshop (I actually worked in there a couple of hours today) I am forcing myself to look at how I do everything in there.
This is my vote for the best push stick design I found, simple, good hand clearance and holds down more than the back edge. It must be good plywood to avoid being weak at the top of the handle. I think I will just leave it attached at the bottom of the handle as well like most regular saw handles. I think it is a mistake to try to be too cute or classy on a piece of safety equipment. Forget being cute and put all of your thought into making it as safe as possible. Save cute for the projects.
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This one for example does not have nearly enough clearance above the blade. On a side note, I know it is just a picture but why use a push stick on a board being cut that wide between the blade and the fence? Just get a good grip on it.
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