Is there a risk of explosion when preparing (should kwikoxycianide not only be dissolved in water)?

The concentration of HgOCN is 0.5% which is by no means too high. I see no risk of explosion considering you are going to dissolve the product in water. I do not think there is any reason to replace KNO3; Apparently it is available as raw material? Given the toxicity, we have the habit of coloring HgOCN solutions blue with a tiny amount of methylene blue so that she is not drunk!