if your really need this clutch cable take out your dad's soldering iron and solder the thing back to getter and file it down smooth, or simply go buy one.
as for wrecking things, it will eventually wear out or damage the gear box. Not great
I have heard from people in the know that yiou should change gears using the clutch on the race track. this might mean that although engines like the lifan are pretty strong, they aren't really made for racing changing without clutch.
I know you can ride motocross bikes without using the clutch. They are actually designed for powershifting (holding the throttle wide open and shifting up gears without the clutch). But i think it will be a bit to much for these type of engines. They wouldnt be designed for not using the clutch.
$3 from KMART, just use any brake cable from a pushy, in fact if u bye a $3 brake cable from KMART, u cut it in half and u get 2 for $3. get a small nut and bolt, wrap the cable around the bolt once, the put the nut on and tighten, fixed.....
id asume the clutches in these bikes work in the same way as normal bikes. bikes are different from car clutches. in a car the clutch actually seperates the motor from the transmission. in a bike it doesnt. it just lets it kind of slip enuf so that u can sit there and idle with the clutch in and it in gear. that being the case the clutch isnt really needed when riding. only taking off and feathering thru corners and stuff. u lose too much power when racing if u change gear using clutch.
just my thoughts. that being said tho if im just cruising round il use clutch. is a little nicer for the engine