A more practical strategy would be maintaining simple yet complete computing environments that can operate on salvaged hardware. NetBSD is a good example: it supports a wide range of hardware, has a relatively straightforward codebase, and provides a full source-based system with a usable graphical userland, with a wide variety of tools available.
In a “collapse computing” context, it is far more plausible to repair and reuse an x86-compatible machine than to rely on extremely minimal custom setups that can barely run a Forth interpreter. With salvaged x86 hardware, one could install a robust OS like NetBSD and immediately run a broad set of existing tools, which is likely to be far more useful than rebuilding a software ecosystem from near-zero on constrained microcontrollers.
This is why having a NetBSD and pkgsrc mirror is my approach to collapse computing instead of fantasizing on building from scratch.