You got married in hk 就easy lah! You can apply divorce on your own, as long as you can prove that you are not living together for more than two years, you get the divorce automatically.
我覺得你要止loss呀,with what you have described him so far I can guarantee you even if he closes the company he will not give you a "bung"! It is more likely he will tell you there are debts need to be paid after closing the company, so he will ask you to borrow money to help him!
Don't sign the application form to let him come to HK, otherwise you and your baby girl's lives will become hell. 你唔諗自己都要諗啊女,三思呀!