You could use a custom message composer to achieve the same behavior in SY now. Slightly more involved than just invoking a bean method, but still gets the job done. Instead of adding the capability to invoke a bean to quartz bindings specifically, it might be nice if we introduced a lightweight composer API which could simply be a bean. That would address your specific case and also make working with composers easier in general.
Thank you for the inputs, Keith
I'll try with custom message composer and update the results