Sure I would. We always had trainees (because we were always trying to grow the business), and if I still was operating a firm I would still have trainees - they would come and train with us because we would pay for all the education/training, just as we did for all our appraisers.
I would take on a trainee and train them in a hybrid way - using the traditional approach and augmenting that with having them get experience credits through PAREA as well. Even factoring in the cost of PAREA, that would reduce my overall training costs and allow a faster path to certification (we always took trainees down the certification path rather than licensed).
Many supervising appraisers have not created an environment that encourages people to stay on staff after they are certified. Long term success with trainees requires a business arrangement that is a win for both the company and the trainee - too many set up arrangements that incentivize folks to leave as soon as they get credentials rather than sticking around and helping grow company revenue. That is just training your future competition. I stayed with my first company for 14 years, mainly because they provided the economic incentive to do so. I replicated that environment when I spun off on my own. I had folks that worked as staff appraisers for me for over 20 years. My goal was to create a support system and pay structure that produced profit for the company while making it difficult for them to leave without taking a pay cut. That basically meant sacrificing short term profit for long term company growth. It also meant investing in support staff to handle administrative tasks so appraisers could focus solely on appraisal (rather than billing, scheduling, records retention, marketing, etc.)