As soon as I have drained the oil, I open all "cocks" on the engine and
remove the water hoses to drain all water from the block

Do you not fill the block with antifreeze afterwards? Even in a warmer
climate the anticorrosive properties would be advantageous.

I like your idea of running the engine after adding the fuel stabilizer
to get it circulating throughout the fuel system. Gotta remember that
one.