Removing the Credit Card option from a Custom Order Form (and set PayPal as default)

We have the PayPal Payflow integration setup and we don’t want to use a credit card merchant account, so it is a hassle that the credit card radio button is still on the Custom Order forms and set as default.

Do you know if you can remove the credit card option completely?

Tech support said someone on here should have the Custom HTML Coding needed to do this.

Thanks in advance!