Glad that you had an automatic system going, but most universities don't have one and can't fund its development, and wanting to shift this burden to professors is unreasonable.
I don't believe “e-proctoring” companies are capable of it, either. I got disqualified from an exam for five `onblur` events (while my screen was being recorded), and it kept counting while the “DO NOT CHEAT” lockout message was displayed; if that's “works reasonably” then I don't know what isn't.
We spent 6 months on it and as far as I heard was still in use as late as 2015.
You don't have to create a whole system; just a database that prepares variants of questions, and a method to put it into the existing exam software.
Why is it unreasonable? What level of duty do you perceive course instructors having to achieving positive outcomes for their students? Who is responsible for pushing improvements beyond the trough of the status quo?