hello friend.
you don't need a full screen sensor panel for a 27" monitor! its overkill as you said, and its not gonna be cool after all.
instead you can make one smaller and lock it on your second display.
like this one:
or a tiny one like this:
its really easy to make a sensorpanel for your own.
after downloading shared (file.sensorpanel) file's, you can find any premade bar and gauge designs in this directory:
C:\Program Files (x86)\FinalWire\AIDA64 Business\SensorPanel
use each one you like.
its gonna be easier if you customize a shared sensorpanel file.