[sgtnoodle]

I've been using this technique to manipulate raspberry pi OS images for use in embedded system prototypes. It's very easy to set up. It's also nice to be able to use the image's embedded toolchain rather than set up a proper cross-compiler. It's slow to compile stuff due to the emulation, but relatively foolproof.

Of course, the best long term solution is to use something like yocto or buildroot, but that takes considerable time and knowledge to do properly.