I'm pretty sure that once it's official, the layout options in the customize options are gone, replaced by the images in the select journal style area.

I *think* that instead of "property use layout_type", doing:

property string layout_type {
des = "Layout Type";
values = "|none|one-column|One column|two-columns-left|Two columns (Sidebar on Left)|two-columns-right|Two columns (Sidebar on Right)|three-columns-sides|Three columns (Sidebars on either side)|three-columns-left|Three column (Sidebars on Left)|three-columns-right|Three column (Sidebars on Right)";
}


and editing the values, will fix it for non-official themes. Will have to look a bit more.