If I got it right, you need first check if that plugin exists. If he does, then add the plugin form folder to the global list of form paths and then load the .xml form file.
* Check if the plugin you looking for exists, then add the form he hold
* string $type The plugin type, ...
Components aren't really meant to be rendered more than once per request. Your best bet would be to make separate requests. Wrapper component and module can be used to display the page using an iframe.
Or you can retrieve the page in PHP using HTTP library. There is Components Anywhere plugin which uses this method https://extensions.joomla.org/extension/...