@ninjaaron I think the jlenv org might be of interest to you? One of the tools is jlenv - a port of the rbnev/pyenv tools. That said the use of binstubs in Julia seems relatively limited, so there maybe sharp edges when using these tools.
The jlenv org contains a collection projects addressing the various use cases that give rise to needing to switch between different versions of Julia.
The announcement in the Tools forum has more details.