With the build.xml of SweetHome3D-7.3, it is possible to do without a macOs computer to create a portable version.
I don't know if this is normal but in the [font=courier new]data[/font] folder, the [font=courier new]furniture[/font], [font=courier new]languages[/font] and [font=courier new]textures[/font] folders are empty.

The other solution, replacing the SweetHome3D.jar file of the existing portable version, still works.
Tip: This also works for the existing installer version.