@kasumi: Yup, this is OTA safe
Unlike, indeed, the few crappy commands laying around the internet (I purged the Wiki, we should be safe on MR ^^). Which provided me with a fun evening of entertainment today, after trying to jailbreak a K4... Utter madness & destruction ensued, apparently simply because of these stupid workarounds...
Anyway, that helped fix the K4 JailBreak doc, and find a bunch of stupid mistakes in USBNet (like, didn't anybody notice that scp was broken? Since apparently forever, and I never noticed because both my K2 and K3 had an old symlink laying around... >_<").