install the InnoDB plugin instead of the builtin one during Sandbox creation
Install the InnoDB plugin during the Sandbox creation.
This option should not require any plugin name. The Sandbox should be able to identify if there is a "innodb" or "innodb_plugin" library in the plugin directory, and act accordingly. It should also install the information_schema tables that come with the plugin.
Probably worth considering the creation of a "plugin framework definition", to allow bundling several UDF/plugins into the same option.