Worth a try if he feels that way inclined, I'm sure he won't have a problem in people raising money for him to live on while his (pro bono) legal team are knocking them down one after another.
What a laugh if the first to fall was Amaral.
However I am more interested in your thinking that he may have had co-conspirators. Just from what I know of the files and subsequent events I think there are grounds for suspecting that Madeleine's abductor was not acting alone.
It will certainly be interesting to watch how the case against Brueckner progresses; like you I wish the German police well with their investigation.
I imagine that if the Germans failed to charge CB & he embarked on a defamation claim against various media outlets he'd have less financial support than Malinka when the latter wanted to publish a book. CB's actions would cause no harm to (or even involve) the McCanns, which is the main incentive for those who contributed to Amaral's "defence" fund.
IMO the reason for German police not sharing the concrete evidence they have with SY or PJ is because such evidence shows others who were present just prior to or at the time the alleged murder was committed.