In Rajesh Sharma & ors vs. State of UP & Anr., the Supreme Court held that Personal appearance of all family members and particularly outstation members may not be required and the trial court ought to grant exemption from personal appearance or permit appearance by video conferencing without adversely affecting progress of the trial. The same for done with respect to 498a cases, but it can be applicable in DV too, since it also involves matrimonial discord only.
So, your lawyer can seek exemption on most dates, but you'll have to appear during important dates, where personal appearance cannot be dispensed with.
Vakalathnama doesn't need to be notarised and he can use the same, without saying anything about it in court as Vakalathnama should only be signed in the presence of the counsel who verifies your signature.
Feel free to call.