I don't have a photo handy, but at one point I was experimenting with something similar. Mine was just a 1/2in PVC pipe zip-tied to a long-handled weeding fork. The idea was to stick the fork in the ground, tilt it, then drop the seed in the resulting gap. It didn't quite make a big
enough gap, but I had so many other projects going that I never pursued it further.
The bend in the hoe you used is far enough that I'd find it hard to use, but if it works for you then awesome!
I might try something different like an ice-chopper. It looks like a hoe, but the blade is in line with the handle instead of at an angle. That
should make a bigger gap in the soil.