I feel like you're conflating multiple unrelated topics together. This isn't advice on how to use another team's experience, or cut costs, or maintain your team morale.
It is difficult to tell at a glance whether an engineer is qualified to effectively use a tool. Letting them self-train by working on self-projects in isolation compounds this effect.
The goal of this exercise is to give time and space to your devs to practice in a safe environment, while allowing them to push, deploy and review projects internally as if they were core products, so that other SMEs are allowed to spend some time every week reviewing those projects for smells and issues before those ideas make it into a core product.
It is difficult to tell at a glance whether an engineer is qualified to effectively use a tool. Letting them self-train by working on self-projects in isolation compounds this effect.
The goal of this exercise is to give time and space to your devs to practice in a safe environment, while allowing them to push, deploy and review projects internally as if they were core products, so that other SMEs are allowed to spend some time every week reviewing those projects for smells and issues before those ideas make it into a core product.