It is not a laptop, it is an "all in one" with a separate wireless Keyboard so I guess that a replacement will be a proprietary one and expensive. Can't find one on eBay or Amazon by a quick search so it will probably mean doing a long search yourself or taking the obvious route as suggested above of buying a USB wireless keyboard instead. Around £20 should buy a reasonable one.
Just as a matter of interestm have you tried stroipping it down and trying to repair the damaged track by soldering a thin wire jumper across the damage. So long as the damage is not on the keypad part it should be a relatively easy repair.
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