When you get involved in a matrimonial legal dispute, the first thing to do is to identify your objective. This is something that most of us fail to do and as a result we prolong our mental torture. When my ex-wife filed for divorce, I tried to oppose it because that's what any advocate's natural tendency was: To oppose what the other party wants. Then it dawned upon me and I asked myself: Do I really want to spend the rest of my life with this woman who is... And contrary to natural tendency to oppose, I looked at her petition as a blessing in disguise and got a divorce decree. Details are not relevant but the point I am making is that DO NOT SEEK RELIEF THAT IS CONTRARY TO WHAT YOUR HUSBAND IS DEMANDING MERELY BECAUSE YOU NEED TO OPPOSE WHAT HE WANTS.
So, you must first and foremost decide whether you want a divorce or whether you want to spend the rest of your life with him. That is not enough. You must also know for sure if he wants to be with you or not and if there are any changes you can make, compromises for example, that will make the relationship last. Then you must be sure that you can actually make those compromises, whatever they are, for a long period and not just in the interim to make the divorce ghost go away. After evaluating such hard facts, you must come to a FIRM conclusion about your objectives. After that, the rest is easy.
LEGAL APPROACH, if you agree to the above quasi-philosophical thoughts, then if he files for a divorce, it means that he does not want to be with you. Really, there is NEVER a point in staying with someone who does not want you. Then should you just admit to his allegations and bend over? No. What you should then do is to file a counter-petition or counter-claim and seek divorce from him based upon your allegations, whatever they be, cruelty or desertion, for example. If he does not file a divorce petition and also refuses to be with you and your child or take care of you, file a divorce petition yourself and seek all the relief you need there, along with a 125 Cr.P.C. application for maintenance and demand for return of sridhan, certificates, etc.
So, what about the ongoing DV case? After you file a divorce petition, seek a voluntary dismissal of the DV case with an application which expressly states that you are seeking dismissal without prejudice to your right to seek the same relief in the Family Court. This way the dismissal order does not impact your rights in the Family Court. You mention "judicial efficiency" and saving of judicial resources and avoiding multiplicity of proceedings to justify your application. Result: You can focus your energy and advocate costs in one Court. Contrary to popular belief, there is NOTHING that a DV petition gives to a woman that she cannot get in Family Court. The whole idea of DV was to give expedited relief to a woman. In practice, it does not work that way.
With respect to your original question about 10 lakhs, since he is not genuinely interested in giving that amount, your query is moot. Based upon his income, Rs. 2 lakhs or even 4 Lakhs is not sufficient one-time alimony. If you see him as an upwardly mobile person, financially, then do not go for a one time settlement. If you see him as a loser, financially speaking, then a one-time settlement is advisable because you do not know what the future holds.