Hi, I'd willing to sponsor scala-pickling since I need sbt for some project. However, my personal policy is to sponsor only team maintained packages. So please if you are not yet a member of the Debian Java team (which IMHO perfectly fits for this package) join the team and commit the packaging to Debian Java Git. Just let me know if you need help to do so.
Kind regards and thanks for working on this package Andreas. -- http://fam-tille.de