I wonder if wrapping a probe in nurses tape is an approved modification or not?
All the legal stuff is a bit like the "voluntary" register we may all have to sign up to to be considered competent to swap one board for another as the manufacturer decrees.
If we are skilled professionals, we should be able to determine the effects of any "modifications" we make, if we are not aware of the effects of what we are doing, we should not be in a position to do it.
Using a "patent" part as a replacement is normal practice in most industries, why not in healthcare, the doctors prescribe "generic" drugs, why not generic batteries or probes?
But more realistically, the manufacturers want us to use them to maximise their profits, they are a business after all. The attempts to stop Techs swapping parts are all cynical attempts to gain the best results for their shareholders. But in reality the deeper the "gouge" the more we start to look at alternatives as we now are more accountable for our repair budgets.