My comment about the txt was flippant; my comments about firearms training are not.
In many ways you are right. If you tick the boxes on the application form there should be no reason why you should not pass the rest of it, but it just doesn't work that way. I speak from 20 years as a police officer, 12 years as an AFO, in three different armed departments, now instructing.
You need a foundation in police work if you are to have any credibility on relief. You cannot buy experience, you cannot bluster though wisdom, you get it from being there and doing it. Those that try are soon found out and often move on.
I have made mention previously about the job; I still love it. Even in my mid forties I still get a buzz when the lights and horns go on. I would recommend it to anyone, but don't be in too much of a hurry to get there. Enjoy the journey. Get the grounding. Do the stuff coppers do, like death messages, domestics, burglary, car chases, demonstrations, pub fights, and you may even decide that you fancy doing something else. But above anything else, fill in the forms (and keep quiet about having a degree, the only person who cares is the Superintendent).