As far as I’m aware, No.
Probably for good reason too, unless done properly a shaft extension could come loose with a 2KG load (wobble saw)on it and cause serious damage to the machine and probably the operator.
The best course of action would be a complete new arbour which is longer than original, but having this done professionally would cost a fair bit, may be worth it on a decent saw but not so much on a Chinese hobby grade machine.