Made the payment, nothing extra charged at OTP stage, transaction showing as "PAYZAPP BILLDESK NON BBPS".
i have a feeling the 1% will not be charged. Will update in 2-3 days after transaction is settled.
IMO, the entire point of charging extra/not giving RPs by all banks was to curtail non-genuine transfers. It is very difficult to trick Redgirraffe since they ask for both side PAN numbers.
So RG is being treated as a normal utility payment intentionally by banks.