You might also want to think about getting a new sprocket couriered in. Shouldn't cost too much given the size, and KL - Kuala Lumpur - should be no problem for delivery etc.
In the meantime, keep the speed down.
How badly is it bent? A good shop should be able to heat it red and let it cool slowly to soften it, then flatten it in a press or with a vise and a hammer!
Heat it red and quench it in water and it should be plenty hard enough. Make sure you file off any damage from the straightening operation before you harden it.
As long as it is reasonably straight sideways - within an 1/8" or 3mm - and not out of round up and down, it should work fine. Super precision is not required.
Note Neals comments on chain tension. Be very sure there is no spot in the chain where the play is less than the required spec. Spin the wheel slowly and be certain.
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