I don't know if I get you correctly, you want to make a payment in bitcoin but you don't want to make use of your debit card to make the transaction for the payment.

If am correct then here's the alternative to use, locate a physical bitcoiner, crypto exchanger or an escrow service providers to exchange fiat for Bitcoin.

P2P is a network that should only comprises of the seller and the buyer to make a transaction, we have a list of reputable members of this forum you can also trust and send them your fiat to credit you with the alsame proportion in bitcoin.

escrow service providers
https://bitcointalk.org/index.php?topic=5047302.0