Try removing the need for interface org.hippoecm.frontend.editor.plugins.field.ConfigurableFieldPlugin

Interface org.hippoecm.frontend.editor.plugins.field.ConfigurableFieldPlugin is used to mark a RenderPlugin as one that needs properties to be shown in the doctype editor, when user clicks on a field, see attachment

This is used in org.hippoecm.frontend.editor.builder.PreviewClusterConfig#getPluginConfigEditorClass to make sure we get a FieldPluginEditorPlugin, this is the plugin for rendering the properties. This entails that custom plugins need to implement this interface (plugin org.onehippo.taxonomy.plugin.TaxonomyPickerPlugin does so).

Investigate if we can ommit this interface: ideally you can access the field descriptor for this field and check if isPlugin(). If so, a plugin that renders properties should be selected (like the FieldPluginEditorPlugin). As far as I've seen it is not possible to access the field descriptor cause this code is running inside a plugin cluster that is unaware of the nodetypes.