Is it necessary to pass the object between two different version of Perl? Or is it sufficient to perform (on the 5.24 side) handwaving that (on the 5.6 side) creates the object and executes methods on the object?

If the latter then perhaps Jörn Reder's Event::RPC might offer some hope? The module originate in 2006 so it might be 5.6 compatible.