Can I use powershell to update the Subsite Templates on AreaTemplateSettings.aspx?

The client would like to limit the available site templates a user can choose from in his My site.

Since a mysite is a site collection – you can’t limit the available templates within a My site.

I can manually update my AreaTemplateSettings page and limit the Subsite Templates of my personal My Site.

I would like to use powershell and loop through all My Sites and limit this list.

How can I use powershell to update the Subsite Templates on AreaTemplateSettings.aspx

(most of the users will not be capable of manually updating the templates)