It seems like an easy solution to this is to have a 'trade academy' or a coalition of trade schools that allow / require you to do a rotation in each of the related trade specialties, i.e., if building / construction related, you spend a week / month / quarter learning about plumbing, electrical, framing, mechanical, landscape, etc. This would both promote understanding of related fields and give people an exposure to a variety of potential interests.
This is not unlike the required courses that predominate pre-major studies at a traditional university (in the U.S., at least)
This is not unlike the required courses that predominate pre-major studies at a traditional university (in the U.S., at least)