Plenty of local firms along the coast have ditched the old credit card rule, they just take the full insurance upfront and you are sorted. Quite a few travellers manage to rent a decent motor without any credit nonsense and just pick up the car on arrival around Turkey with a standard debit card, no frozen deposits at all. The daily rate runs a bit higher compared to standard bookings, but there is zero stress about holds. You can check the specific terms for debit pickups here
https://turkey-rentcar.ru/en/no-credit-card/ .