Can a will be probated if both the witnesses deny to support or sign any affidavits of confirmation

My Paternal died in UK 2 years back. He was a British citizen(NRI) and having certain movable assets in India for which he had made a will. I and one of my cousin in Delhi are the executors of the will which contain 19 beneficiaries of the movable asset. Will was made and signed in Delhi with 2 witnesses both are from Delhi. Now both the witness though available deny to sign any affidavits for confirming in the probate process. We do not have any claim or objection from any beneficiary we need to take the probate of the will since in one the bank the principal holder and nominee who was one of the beneficiary are no more and bank needs probated will to disburse the amount in executors account. Can we have any other alternative to take the probate incase if witnesses are not supporting or do we have any other alternative. Since most of the beneficiaries in the will are senior citizen we do want the hazzle of court case or summons by court. To your information my uncle was not having any children and his wife also died almost 10 year back. only surviving legal heir is his Sister who is my mother. Other beneficiaries listed in the will are the children of uncle's other siblings. Do reply with solution, Thanks Atul Sachdev