The latest STM8EF release v2.2.15 contains a CN2596 DC/DC board binary that works great with the latest e4thcom STM8EF plug-in.

Here is a demo (asciinema garbled the console key input a bit):

Please note that the coding examples can now use the e4thcom Forth code #include & #require features. It's also possible to create binaries from the same code using the STM8S simulation feature of uCsim.