What chance that there exists a build of Linux netinstall-cli binary that runs on arm?
So far none. You can ask MT directly (e.g. by sending e-mail to support@mikrotik.com), but my guess is that they won’t bother supporting that platform/OS combination.
Would make sense to support that any time soon. With RouterOS 7.4 have have container support, would be nice to have netinstall in a container…
+1 for this, would also be wonderful if it could be compiled for Mac… or you know… release the source code 
After a bit of an adventure, you can actually run the netinstall-cli on ARM perfectly fine using qemu-user binaries
Effectively it will emulate the CPU for the process, it doesn’t start a VM as most would know, and leaves the process where it should be (eg. it can access the network perfectly fine)
I have actually bundled this into a container now http://forum.mikrotik.com/t/guide-running-netinstall-server-on-a-tik/161056/1