"impossible" yeah ok.
Ask Eon for it.
Look, it is not possible to even notice people that save bricks, as saving them is entirely client-sided.
It
is possible to do something when people request the extended info (brick names, events, stuff, if they have that checked)
if you modify blockland to let you package that function.
Alternatively you could turn on trace and hook an external program to scan that output for that function, which is extremely inefficient.
Both are not acceptable methods for an add-on.