I’m working on this for the sc3-plug-ins release as well right now, and I don t think you even need to sign them, but you do need to remove the quarantine attribute on the file. I’m a terminal, please try to CD to the directory and try
xattr -d com.apple.quarantine Filename.six
Replacing the correct filename at the end.
Please let me know if that works!
Josh
/*
Josh Parmenter
www.realizedsound.net/josh
*/