Best market for small S&P 500 call

Background: I want to "borrow" some money from my portfolio that I intend to repay by 2028. Sum in question is ~$10000.

To keep overall exposure I'd like to buy ATM S&P 500 call with expiration date no earlier than January 2028 with notional value of 8k-12k. So SPX index and SPY ETF markets seem to offer too much. For now I am looking at SPYM but it has worse spreads than SPY, not sure about execution. Is there a better market to fit my needs?