Post the FIR in EOW, can I change my lawyer

Hi, I have been able to register a FIR against a builder who is neither been completing the project nor refunding my money. He has just been sittting on the money. I have also approached RERA for refund of money. My questions are 1.) What are the timescales to file the chargesheet by the IO once the statements has been recorded and verified document copies are handed to the police? I have heard that in certain cases the EOW department progresses very slowly as builder lobby is quite strong. 2.) Since the FIR is a collective FIR filed by a a group of 10 people and a single lawyer for the group. Can I replace the lawyer (just for myself) while the investigation is in progress with the IO? 3.) If the builder does not follow the RERA orders then execution needs to be filed but the end result of execution is an arrest warrant against the builder. That is based on the assumption that builder has withdrawn all money from the project bank accounts. So if the same result is acheived via EOW FIR, is it not a faster remedy? 4.) Is there any other better legal remedy which can provide faster results given that RERA hearings these days are 3.5 months apart and then execution process itself may take around 2 years or more.