Hi Frank,
Ive done something simi;ar in the past. Our approach was to create a cockpit plugin. We created a find by business key plugin and the information you are typically after is available in the history tables. Hence have a look at the plugin store and code sample for inspiration.
In addition, we created a 'read only' cockpit for business users. This can be done via config of cockpit. We called our deploymnet Dashboard to differentiate it from the operations cockpit.
I beleive the new tasklist supports plugins, so you may be able to create a plugin for tasklist to meet your requirements...
Rob