"Solid, mentored and verifiable", I would accept that if it were over a training period of more than 250 hours. Most of which you don't fly if the weather is bad. At the end of this solid mentored verifiable training you are subject to testing standards which are lower than a UK driving test I.e. a pass rate significantly higher.
I also have operated with cadets who have these levels of experience, albeit outside of Europe. Mostly they have not met even the minimum standards that I or my colleagues would have expected.
I would understand the employment of the top 10% of cadets in combination with the employment of suitably experienced Pilots along the lines of what BA have always done.