You can buy cheap verification code with Bitcoin or Monero. Not sure if it's possible with Zelle though. You might give a try to smspool.net or sms4sats.com (LN⚡) or others

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But Zelle number needs to be linked to a bank account. Do you use disposable verification numbers tied to your Zelle account?

I don't use Zelle as it isn't available to my country. It's just a way to obfuscate your phone number to your BTC dealer. Please do not use SMS verification as a 2FA for your Zelle account. Maybe asolutikon like MySudo would be more easily trusted however I can't use their service in my jurisdiction and it might be the same for you.