I would suggest that the conversion to the more strict source format be done first just as a formatting change, leaving unsourced statement in place, but more clearly tagged as needing improvements in sourcing.  That would be a less drastic step than just tossing anything that is unsourced.  However editors have the right to cut unsourced material at any time, per Wikipedia:Verifiability.  Another alternative method is to move unsourced statements to the talk page pending rework or sourcing.  My sense is that this article needs to be completely rewritten, which will take several months, and that the safest approach for a team effort would be to make just small incremental edits that can be carefully considered and judged by the team.  A massive rewrite would not be consistent with a team effort.  If we get no objections to the proposal to improve note format, I am willing to help work on the format pass.    