I don't think everyone shares _my_ dreams, which mostly don't involve Smalltalk images, but this seems quite feasible. And, from experience, making languages interoperate is a hassle, so "written in different languages" isn't all great.

In the particular case of Smalltalk, the operational(?) semantics of which are specified by a virtual machine, one can just compile targeting the virtual machine. c.f compiling Smalltalk and Java to the Self virtual machine, or all the compilers targeting the JVM nowadays.