You might try SDTV or Fullscreen (plus DVD or VHS since those were the last formats that typically offered that aspect ratio regularly) as tags/search terms. I am otherwise unaware of any specific automated search options for 4:3 content. :/
Obviously it would take some work, but you could set up an automated set of scripts that would crop the videos and spit them out as 4:3.
Is there no option within the vr application itself to auto zoom and crop videos to fit the TV?
I guess my only question for you would be... Why did you stop doing the two hobbies you enjoyed? You called them addictions; were they interfering with your ability to work and get necessary chores/tasks done? Or were you only doing them in your free time?
If it's the former, then good on you for the self control! If it's the latter, I'd honestly just be confused as to why you gave up what you love doing and would just encourage you to stop punishing yourself.