It would definitely take up some team resources, but it's not more complex than the work they're already doing. So 'how would you do that' is the wrong question. The question should be 'how would they do that?' and the answer I don't know but I'm sure if you ask a team they'll be more than happy to explain, after all it is their (and not my) future that is at stake and given the fact that they are involved they'll do the best possible job to make sure they have to go through it the minimum number of times with the largest chance of success.

This is still far less effort than a wrong hire would cause. Anyway, I can see that my methods are not acceptable (yet), maybe in another decade or so?

Trust is hard. Even companies that trust their tech people with the corporate crown jewels still have a hard to impossible time trusting them with such everyday decisions such as who they want to work with. It's counterproductive to say the least but that's how we've been doing it for the last 40 years, so I don't expect any major changes in the near future.