What I do if I want to use experimental (or sid if I am on testing) is to put the deb-src-lines in my sources.list and then build a package when needed. I find wajig convenient to use (another front end to apt) in this case e.g.
$ wajig build julia Regards Johann -- Because experiencing your loyal love is better than life itself, my lips will praise you. (Psalm 63:3)
