You can probably nerf 'em at the source in the elektra db (I don't have a Kindle on hand right now, and I don't remember what exactly is tweakable, but most of the daemon manager setup lives here, and I'm pretty sure there are leaves dedicated to the OTA stuff in there).
(That's... not any easier/cleaner than renaming the binaries, though, since I don't think they ship the elektra tools in the FW, and it's in the ro rootfs, *and* mounted from a squashfs image IIRC. But at least that would prevent the daemon manager from retrying the startup like an idiot. Probably. Like I said, haven't even looked at a Kindle to spout all this, so, err, take this with a grain of salt
).