I have an account at Bitmart. It's a pain but you could convert ETH to Tether and then Tether to BNB and back to Metamask. Luckily I have enough cash at Coinbase which I use for ETH or BNB chain buys. ETH I can send right to Metamask. On the BNB side I have to convert US dollars to Tether, Tether to Bitmart, Tether to BNB and then send the BNB to Metamask. Then I use Pancake for BNB side buys and Uniswap for ETH side buys.
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