You can't pay more than 2 years backwards for another person. Only the person who is registered as the owner with a valid ID can do it and it takes about 1 week as the green book is void and they do a new one. If the owner is not available then you can use the motorbike for spare parts only or paying 2000 baht fine every time police stop you. No insurance, no tax + accident means a minimum fine of 20.000 baht a you pay all the damage out of your pocket