Paper trading companies conducting evaluation where upon passing the evaluation to issue loans as funding

Dark grey.

You can’t get into this like that POA or block people from withdrawing money to their accounts. Lending money as an AP is also not allowed by SEBI.

You will need NBFC to lend, but NBFC can’t lend money for F&O, intraday trading, etc.

A customer could request the broker, but it is hard for a broker today to customize this. The risk management rules are set at the overall level, so will be hard to customize unless it is a very small broker.

Maybe you can check this thread.