You can do it though the API.

Create a get request to https://api.getpostman.com/collections/' + collection_id, and then in the Test tab where you usually run scripts from, you can use something like this:

var postman_api_key = pm.environment.get("postman_api_key");

var response = pm.response.json();
var collection = response.collection;
var collection_id = request.url.split('/')[4];

function processItem(item){

    for (let i = 0; i < item.length; i++) {

        if(item[i].request){
            if(item[i].request.auth){
                var t = {};
                t.type = 'inherit';
                item[i].request.auth = t;
            }
        }

        if(item[i].item){
            item[i].item = processItem(item[i].item);
        }        

    } 
    return item;
}


collection.item = processItem(collection.item);

var update_collection = {};
update_collection['collection'] = collection;

const postRequest = {
  url: 'https://api.getpostman.com/collections/' + collection_id,
  method: 'PUT',
  header: 'x-api-key:' + postman_api_key,
  body: {
    mode: 'raw',
    raw: JSON.stringify(update_collection)
  }
};

pm.sendRequest(postRequest, (error, response) => {
  console.log(error ? error : response.json());
});

This probably isn't doing 100% exactly what you want, but it's probably close enough that you get the idea, and can modify it yourself.

Then just execute the dummy request