I am also a victim of 498a like u .
Do not compromise in your case and do not hurry for divorce unless and untill u r mad for a marriage again.
Let the girl suffer a lot. If your wife wants divorce tell her to quash the false care first. If the police is not submitting Charge sheet then ask Honourable HC to pass a order against police to file chargeshhet within a said time.
After she quashes the case(if she does) just made her mad with cases asking maintainence , false evidences etc etc and by doing press releases.
If you know the NRI with which your wife is engaged just tell him about your wife's nature of filing false cases and asking money.
Feel free to contact me in email@example.com