vaccination is not required if a person has recovered from a prior infection. It admits that natural immunity is as good, or better, than vaccination.
Yes, I don't think this is in dispute.
Covid is the first disease that is being promoted by governments in contradiction of this fact.
Well, not really. Your route to natural immunity is to catch the virus. If the virus can be fatal, it is preferable to take a safe, proven vaccine. Quite apart from the fact that if you catch the virus, you can spread it to others.
I genuinely believe that I have strong natural immunity
But if it's not proven, then it's simply belief, which may be flawed.
because of my lifestyle and age, I cannot afford to risk vaccination
It's not suitable for everyone. This is why there are screening questions. Even so, there is I suppose in theory a very small chance that you have an undiagnosed pre-existing condition, which means you're not suitable. In such instances the vaccine can cause problems... but it's highly likely that for such a person catching Covid would have caused more severe problems.
I believe that vaccines should be tested comprehensively, and the result made available for public scrutiny.
They have been, they are. It's understandable that the vaccines are released quickly given a global pandemic, but they have still completed the standard trials process, and date are available.
many of the vaccination failures may be the result of a failure to aspirate the syringe before pressing the plunger.
The people administering the vaccine must be properly trained, yes. Not least so that they accurately identify those who shouldn't take the vaccine.