Well. GoboLinux solved that already. Back in 2005.
I never understood the real need for chruby rvm etc... - I manage everything, all programs, in a versioned AppDir manner. (Note: I am not using GoboLinux; I use a modified variant. GoboLinux gave the correct idea though.)
> each program in a GoboLinux system has its own subdirectory tree, where all of its files (including settings specific for that program) may be found. Thus, a program "Foo" has all of its specific files and libraries in /Programs/Foo, under the corresponding version of this program at hand. For example, the commonly known GCC compiler suite version 8.1.0, would reside under the directory /Programs/GCC/8.1.0
> mise can be used as a drop-in replacement for asdf. It supports the same .tool-versions files that you may have used with asdf and can use asdf plugins through the asdf backend.
> It will not, however, reuse existing asdf directories (so you'll need to either reinstall them or move them), and 100% compatibility is not a design goal. That said, if you're coming from asdf-bash (0.15 and below), mise actually has fewer breaking changes than asdf-go (0.16 and above) despite 100% compatibility not being a design goal of mise.
> Casual users coming from asdf have generally found mise to just be a faster, easier to use asdf.