macOS Anyone good with Applescript?

Why not just set up a non-Admin, restricted account? You can use Parental controls to prevent editing the dock, access to System Prefs and more.

There is also the Guest account option that deletes all data on logout. I dont know if you can set a Guest account to automatically log in or not (wife is using the iMac and I am on my DELL Craptop from work).

This worked for me:

display dialog "This computer will restart in 60 seconds... to continue working click Cancel." with icon caution buttons {"Cancel", "Restart"} default button "Cancel" giving up after 60
if button returned of result is not "Cancel" then
tell application "System Events" to set the_apps to name of every application process whose visible is true or (background only is false and visible is false) and name is not "Finder"
repeat with each_app in the_apps
tell application each_app to quit without saving -- WARNING: "without saving" will override dialog boxes; unsaved changes in open documents will be lost!
end repeat
tell application "System Events" to restart
else if button returned of result is "Cancel" then
end if

Save the script as an application bundle, Options off, and set it to open once every hour using CronniX.

Notes:

The computer will restart if the user takes no action after 60 seconds once the dialog appears, or if the user presses Restart. The only way to prevent a restart is by pressing Cancel.

Although you may be aware of the consequences of using "quit without saving" in the script, the warning comment is included for those who may not be, just in case.

Using CronniX:

1) From the File menu select either Open for User or Open System Crontab. From the toolbar click on New to create a new crontab entry.

2) Choose a "Simple" schedule if you want the script to run, for example, every day at 15 minutes after every hour. Do this by checking "All" for Day of week, Month, Day of month, Hour; and move the Minute slider to the right until you reach 15 (the number 15 means fifteen minutes after the hour, not every fifteen minutes).

3) Press the Browse button, navigate to the saved script app and press Insert. Check: prepend "/user/bin/open" and press New. Save changes and quit CronniX

Good luck.