Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Interestingly worked correctly using the freddie chopin build of OpenOCD via command line with no issues, so just pointed system workbench to this exe and used the associated nucleo L1 script and all appears to be working.