Dear Sir,
With much pains I regret to say that there is no such provision to accept the affidavits. But you may confront the witnesses with the portions of 161 statements and get them treat a hostile by prosecution. Signatrures are not necessary for 161 statements. Not the the option left to you appraoch the HC and seek time bound disposal of your case. Plese visit the following link for conducting cross examination. You may call me for more guidance.
http://mja.gov.in/Site/Upload/GR/summary%20of%20second%20work%20shop%20criminal%20dated%[deleted].pdf
Section 161 in The Code Of Criminal Procedure, 1973
161. Examination of witnesses by police.
(1) Any police officer making an investigation under this Chapter, or any police officer not below such rank as the State Government may, by general or special order, prescribe in this behalf, acting on the requisition of such officer, may examine orally any person supposed to be acquainted with the facts and circumstances of the case.
(2) Such person shall be bound to answer truly all questions relating to such case put to him by such officer, other than questions the answers to which would have a tendency to expose him to a criminal charge or to a penalty or forfeiture.
(3) The police officer may reduce into writing any statement made to him in the course of an examination under this section; and if he does so, he shall make a separate and true record of the statement of each such person whose statement he records.
Section 164 in The Code Of Criminal Procedure, 1973
164. Recording of confessions and statements.
(1) Any Metropolitan Magistrate or Judicial Magistrate may, whether or not he has jurisdiction in the case, record any confession or statement made to him in the course of an investigation under this Chapter or under any other law for the time being in force, or at any time afterwards before the commencement of the inquiry or trial: Provided that no confession shall be recorded by a police officer on whom any power of a Magistrate has been conferred under any law for the time being in force.
(2) The Magistrate shall, before recording any such confession, explain to the person making it that he is not bound to make a confession and that, if he does so, it may be used as evidence against him; and the Magistrate shall not record any such confession unless, upon questioning the person making it, he has reason to believe that it is being made voluntarily.
(3) If at any time before the confession is recorded, the person appearing before the Magistrate states that he is not willing to make the confession, the Magistrate shall not authorise the detention of such person in police custody.
(4) Any such confession shall be recorded in the manner provided in section 281 for recording the examination of an accused person and shall be signed by the person making the confession; and the Magistrate shall make a memorandum at the foot of such record to the following effect:-" I have explained to (name) that he is not bound to make a confession and that, if he does so, any confession he may make may be used as evidence against him and I believe that this confession was voluntarily made. It was taken in my presence and hearing, and was read over to the person making it and admitted by him to be correct, and it contains a full and true account of the statement made by him.
(Signed) A. B. Magistrate".
(5) Any statement (other than a confession) made under sub- section (1) shall be recorded in such manner hereinafter provided for the recording of evidence as is, in the opinion of the Magistrate, best fitted to the circumstances of the case; and the Magistrate shall have power to administer oath to the person whose statement is so recorded.
(6) The Magistrate recording a confession or statement under this section shall forward it to the Magistrate by whom the case is to be inquired into or tried.