Ball of Wax
Actually after reading up on a little copyright law. As the copyright holder of the additional code. I can chose to redistribute that code under a more or less restrictive license as long as it does not contain any incompatibly licensed code within its whole, regardless of any and all clauses defined within previous licenses (including a strong copyleft). However if any of the code that I am not the copyright holder of were to remain, then it would be unlawful for me to release it under any license that violates its license.
At least, that is as I understand it. I'm not a lawyer.
So Rednaxela is in the clear, as is Etna/Scarlet. But I do have to change Nene's license until such time I remove all RWPCL code from it, even then the older version of the code would still be RWPCL, as it contains Raiko's Gun (which is licensed under the RWPCL).