How can I prevent grass overtaking my cobblestone path? It was so bad I had to cut sod strips out!!?

The path has been in place nearly 8 years and had gone from a width of 3 to a narrow 1.5 because the surrounding grass grew over, coming up between cr

The path has been in place nearly 8 years and had gone from a width of 3' to a narrow 1.5' because the surrounding grass grew over, coming up between cracks and then simply growing on top of the stones. I sprayed the whole path with an Eco-friendly, non-selective herbicide (essentially a very strong vinegar solution) and cut out the resulting dead (& already returning! grass).
My plan is to sweep & pack down sand between the cracks, then try to better stay on top of grass as it emerges. Given the stage I'm at though, I wonder if there's another preventative course of action to actually further prevent the encroaching grass and weeds (it was mainly just lawn grass I had growing there, not so much typical weeds).
**I am NOT prepared to pull up the stones, lay landscaping material or cement, and re-set the stones.

or:The path has been in place nearly 8 years and had gone from a width of 3' to a narrow 1.5' because the surrounding grass grew over, coming up between cracks and then simply growing on top of the stones. I sprayed the whole path with an Eco-friendly, non-selective herbicide (essentially a very strong vinegar solution) and cut out the resulting dead (& already returning! grass). My plan is to sweep & pack down sand between the cracks, then try to better stay on top of grass as it emerges. Given the stage I'm at though, I wonder if there's another preventative course of action to actually further prevent the encroaching grass and weeds (it was mainly just lawn grass I had growing there, not so much typical weeds). **I am NOT prepared to pull up the stones, lay landscaping material or cement, and re-set the stones.

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