re: Shelf stable fillings and frosting.

I got all my recipes basic ones that people would generally ask about. Then trying to.reinvent ganache that would pass and buttercream recipe. I use heavy cream in both and cant find ny way around it. This is kind of frustrating. I am thankful but wish it was simpler. I live near sacramento. The closest food lab 2 or more hrs away.
Thanks for your advice wish you luck too.