Looking to make 2-3 steps down into my crawl space and get rid of the cinder blocks. - Should I make a form and pour it as one big block or, 'layer' it? - Would it be advised to anchor it to the foundation? If so, how? Thanks

I have sandstone slab steps outside of my house. One of them has a fair size pit after the Winter, and the contractor that did this work is basically sticking me on flipping the step out for a new one, but I digress. As an example, this is essentially what we have: [URL="https://www.techo-bloc.com/products/rocka/"]https://www.techo-bloc.com/products/rocka/[/URL] That said, minimally as an interim solution, I was going to try to patch this hole as close to decent looking as possible, as I have two little kids that play out back and it worries me that a toe/shoe goes in there and they face plant. For discussions sake, lets say the hole is 1-1.5" deep, and while it's more of a circular pit, lets say it's about 5 square inches surface area wise. It's worth noting that the original material can be removed (or placed in the pit) fairly even with the pit itself. My idea was to make a 1:3 concrete:sand mix, and perhaps play with some mortar dye to try to make up something that looks like it may dry somewhere close to tan/sandstone color, and fill the entire hole. My second idea involved the same mortar mix, but I was going to basically use it as a "glue" to push the actual material that can fit in the pit and then try to even out the cracks and feather it out across the step as good as I can. Nothing is going to be perfect, which makes me sick to my stomach, but looking for something to mitigate the risk. I've looked pretty extensively online for a dedicated product for something like this, but there's nothing I find that's a "Sandstone Filler" in concept. I'm wondering if the majority thinks this is as close as I can get on my own in the absence of fully replacing the step?