In practise your university will not provide you with the time/resources to do extras like these.
On top of that as an educator you have a real responsibility not to send someone on a hail mary without fundamentals, which might ultimately drive them out of university because it will not get easier after that. This is a real risk.
Another aspect: What so you think how many students will try to skip classes if word gets around it is actually possible to do so? How many of those will cheat to do so? And bow many of those who made it through will be able to face the next exam without cheating?
That seems like a bad reason to err on the side of unconditional speed limits. Opportunity cost is real.