yes, I think this is no problem, the active part ist the chromium(VI) which is the oxidizing agent. Instead of 9.5 g take 8,14 g ammoniumdichromate. In other formulas they take only 5 g potassiumdichromate. and 5 ml conc. sulfuric acid.
I'm sure you know that all chromium(VI) compounds are toxic and carcinogenic. Before you discard the used bleach you can mix it with as much used developer until it turns green (do this in open air as sulfur dioxide is formed by reaction of the sulfuric acid with the sulfite from the developer). The orange chomium(VI) is reduced to the green chromium(III) which is much less toxic and harmful to the environment and is no longer carcinogenic.