Expense ratio is directly adjusted in backend by ETF provider and NAV is adjusted accordingly. So to all your 3 questions, answer is NO, there will be no impact or charges just for holding your ETF.
This concept is same for all Mutual funds schemes.
Only charge I could think of your demat AMC charges which you will be charged by your broker/demat account provider.
AMC’s don’t charge expense ratio seperately. It is deducted on daily basis as tiny fractions of annual value. So everyday when AMC declares NAV, the expense ratio is adjusted in it.
Other than AMC, which is Rs. 300 + GST (charged every quarter at Rs. 75 + GST) there are no other charges.