Using Powerbook G4 as an extended screen

I have an older Powerbook G4 (OSX 10.4.11) with a gorgeous 17" screen that I would like to use as an external display for one of my two mid-2012 MacBook Pros (one is running Sierra, the other is running Mojave).

Why I'm asking: Apple hasn't been making any new laptops with 17" screens, and their 16" tv-style screen ratio does nothing to improve upon my current setup. Additionally, I already have 4 macs in operation and don't really have space to add an external display (plus the one I already squeezed in was of such poor quality compared to a native apple screen that I returned it). So I'm back to either continuing to survive with my current set-up, or finding a way to extend the usefulness of my PBG4 beyond its current shining function as biz accounting database and Laserwriter 4/600 print server.

Is there any way to do this?

Thanks for sharing of your wisdom and expertise in this matter