one article in TK magazine once suggested a "boning knife" (long, thin flexible blade) in a cardboard and duct tape sheath. here in the states, a knife like that is about $10 at wally world or similar.
i've seen some guys suggest zip tying tempting items to the frame of your checked baggage. most of these roll on bags seem to have some kind of frame inside.
if you're really worried about it not being there when you reach your destination, pack an easily replaceable, but decent knife. from Spyderco, Kershaw, CRKT or whoever. i picked up a new CRKT Hammond Cruiser for $25 shipped in the exchange. it's a bit thick for carry clipped in your pocket, but a fairly decent knife, especially considering the price. i got it to stash in the GHB/ruck i keep in the truck.
or consider a Superkinfe. the ones with he plastic handles are kinda nice for utility use and could be used as a defensive tool in a pinch (they just don't have much reach). i don't really like any of the utility blade folders with aluminum scales. they're under $10 and you can buy a pack of Stanley blades at your destination or carry them in your checked baggage. take the blade out and put the bladeless "knife" in your carry on for travel. i don't think TSA will try to snag a tool with no blade.