I don't see why you need any guides for the second option. It's really as simple as downloading + running the installer of the 32 bit version of VSCode and clicking "Install" on the Kha extension pack. From there you should be able to follow the usual guides / start a new project with the "Init Kha Project" command.
Please don't use Kha from haxelib, it's completely outdated. Follow the instructions at http://kha.tech instead.
Maybe you should push a new version to Haxelib that just has an
extraParams.hxmlcalling an init macro, throwing an error that says exactly that.