Hi and welcome to Roon‘s forum, David!
There‘s likely no quick fix for your idea, and note that the extension isn‘t maintained any longer either, but …
I‘ve basically a comparable implementation on my DIY Roon metering bridge as shown here, but at least that may get you started on further tinkering to turn the screen back on again on restarting play.
You might have to find the script that checks for zone playing status and then could add issuing a fake HID input that activates the screen again, since said implementation likely just changes the Display Power Management Signaling (or DPMS) setting which can‘t turn the screen back on…
Keep us updated on your progress, please!