Remove Express Payment Gateway Options?

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I have a Payment Gateway script which removes all payment gateway options except for one. This works on the payment step however I noticed that it does not affect "Express" checkout options such as Paypal and Amazon:


Screen Shot 2019-09-17 at 4.21.20 PM.png

Is there a way to remove Paypal & Amazon express payment methods using Shopify Scripts editor?

Input.payment_gateways.delete_if do |payment_gateway|
    next unless != ALLOWED_GATEWAY

This is the script. For now, I've resorted to just adding custom Javascript to the checkout.liquid layout but I'd very much prefer relying on the Script Editor if possible.