Hi,
i have used Mycryo to set a raspberry mousse with no gelatin, it works very well if you keep the temperature under-control otherwise it will split (almost like when you make pound cake and the eggs are too cold).
So start with a rather warmer base (depend on your recipe..) and then add your Mycryo in.
I have tried to replace Mycryo with just "Microplaned" cocoa butter and it works fine in pastry application.
If you would like to have a very fine powder, a simple trick: Temper CB, put in a spray gun and spray into a tray, scrape, put in a container and there you should have a fine powdered cocoa butter...