Icon.library 46.4.326 has been released on Aminet:
Aminet - util/libs/IconLib_46.4.lha
The 68000 version is included now and seems to work as reported
(successfully tested on 3 Amiga 500+ systems).
Try it out ! You will get the best profit if you use it together with one of the original workbench.libraries v44+ up to v45.127, which can also be installed on any 68000 system, either with LoadResident or SetPatch v44 as explained in the icon.library readme file.
Of course, the icon.library has support for the older workbench.libraries v39 and v40, too.
Recompiled Stephan Rupprecht's CopyIcon for the 68000 CPU and WB 3.0+
This CopyIcon version needs no 020+ CPU and can be used without any files from OS 3.5+.