I wasn't able to do anything like this either for a page, although I'm sure it can be done if you use a callback instead of the default settings. In my case, I simply removed the breadcrumbs from my custom pages all together using this: <xf:css>.p-breadcrumbs{display:none}</xf:css>
If you want to simply hide everything except the first breadcrumb (home in your case), you could use something like this: <xf:css>.p-breadcrumbs li:not(:first-child){display:none}</xf:css>