Notice that on the EEA projects we never use the Volto project to do any actual Volto coding or configuration, we use Volto addons exclusively for that. Usually it doesn't make a difference, but I think, with this addon, because its config executes before your project configuration, it makes a difference. You can just copy its entire code (it's just one file) in your project and control its execution order from there. Another option would be to use env var to configure it, RAZZLE_VIRTUAL_HOSTED_PATHS, check its source code.