Display the resolved command line at request (especially when made of a lot of properties)

Based on customers request (Vert baudet, ....) illustrated with what I am working on right now :

When creating a command line like this one :

[[SI.pg]] [[SI.c]] [[SI.dev]]_[[JI.c]] [[SI.d]] [[SI.date]] [[SI.i]] [[SI.ini]] [[SI.t]] [[JI.c]]

it would be great to have EM / SM displaying something like :

About to execute : e:\opcon16\misc\holiday.exe /C: RR_FR /Y: 2016 /I: holiday.EFG.ini /S: FR