Hi Philippe,
I think this would be good that we provide a dedicated module for Jasypt and still export to ws security module. This will allow the old application with jbossws-cxf-client module dependency added can still access jasypt classes and work. If other application likes yours doesn't want this jasypt exported dependency , it can be excluded with one line exclusion config in jboss-deployment-structure.xml. Does this work for you ?
BTW, upgrade jasypt to 1.9.3 is the missing part in wildfly. I'll fix this soon. I added this discussion to WFLY-13059 too. If you like, let's add comment/discuss there.
Cheers,
Jim