Thanks to the fine people at our university we have now enabled the applets on the pages of C.a.R. (Compass and Ruler) and Z.u.L. (Zirkel und Lineal). The user does no longer have to put the site into the list of allowed sites in the Java configurations. The applets have a valid signature which is trusted by the main certificate authorities.
The process was not easy. I won’t go into any details. We needed to install the Mozilla browser since our description was based on that.
See here an example of an applet.