For Spire Reef, I'm currently planning something similar where a long chain of prerequisite quests are necessary in order to take the Rank D exam in the area.
That said, an apprenticeship by itself doesn't quite satisfy the thematic topics I'm looking for in the Rank D exam. There needs to be something more.
There's a certain degree of flexibility to the world, so if it makes sense in your imagination (e.g. with magic), you can probably get away with it. That said, most people treat AG as a medieval / ancient fantasy, so modern items come off as a little weird.