Assuming, I apply for voluntary registration and obtain GST registration: Will I get ITC on the IGST paid on branded rice lying in stock on the date prior to the date of my liability

Yes, a person who takes voluntary registration is entitled to take credit
of input tax in respect of inputs held in stock on the day immediately preceding the date of grant of registration. In this connection, section 18(1)(b) read with section 25(3) of the CGST Act, 2017 refers.

(FAQ 9(v)(a) : FOOD PROCESSING)