SharePoint provisioning with script; crawled property question (only available after item in list?)

I want to do a scripted site-collection provisioning. So I create everything by script, like:

- Managed metadata

- Crawled properties

- Managed properties

- Content types

- Lists

- Etc

 

It looks like I am facing a challenge creating  managed properties. This is what I do:

 

- I create custom content types

- add the to a list

 

I assume the crawled properties are generated by SharePoint but they are not.

It looks like they are only generated when I add an item to the list.

Only then they appear in the crawled properties. After that I can create Managed properties.

 

Am I right? Or do I miss something here? 

If so, is there some kind of workaround?

 

Thanks, Mike