How to get resource path without publishing it with RelPermalink?

It looks like Resource.RelPermalink publishes the resource to /public, but I don’t want to do that because the resource isn’t fully processed. I don’t see anything like .Path in Resource methods.

Context:

I’m executing a resource as a template and putting the result next to the original resource (same nested directory hierarchy), e.g.

Input: assets/css/theme/mycss.css
Output: public/css/theme/mycss.ac6c302f8221a01b05fa6c351c83a274bf4e173b.css

The file is then processed by fingerprint, minify, etc.

maybe Name or Title ?