If you don’t qualify for the CSR bonus, then you don’t qualify for the CSR, unless you’re talking about an upgrade of an existing card.

If you’re looking for lounge access and don’t want the Amex Plat and (possibly) can’t get the CSR, that leaves the Citi Prestige, which has an annual fee of $495 but offers much worse lounge access than the Amex Plat, especially at SFO and SEA.