I've been looking for decent jointer push blocks. The rubber soled get too slippy over time and IMHO don't excel at pushing heavy stock across the bed. The heeled ones are not appropriate for long stock. I love my Euro-style blade guard, but still don't trust that may hand won't slip under. I made these last night. Wish I could take credit for them, but I found the solution on the 'tube.
I deconstructed 2 cheap notched trowels from the tiling section of the home store ($3.00/ea). I screwed the handles to scrap blocks of 3/4" plywood. On the bottom side, I screwed two mending plates ($0.80/ea).
I can attest to the video's assertion that the spikes don't really harm the wood, because you don't have to bear down so hard. Anyway, I usually plan to plane the 'spiked' side.