I think its a good idea to present a default payment form/display and then opt into other payment methods. so that there is potentially one step less from "select product" -> "payment done".

I also think it makes sense to structure the payment method display a bit more.

current

• paypal
• stripe
• gocardless
• ...

after:

• Credit Card
  ----stripe
  -----paypal
• direct debit
  -----go cardless
• wire transfer or in-store
  ------ offline payment
• digital currencies

• bitpay (bitcoin ,....)
• coinbase (bitcoin,...)

Do you have Credit Card and ACH disabled under Settings > Company > Billing/Payment > Accepted Payment Types? I ask because the payment page in the client area includes the ability to use a new credit card or ACH, and non-merchant gateways are listed under "Other Payment Options". If CC and ACH are disabled so that only non-merchant gateways are available, and there is only 1 I can see skipping this step entirely.

Do you intend for this to work similarly on order forms also? Order forms are a bit simpler because the gateways available to an order form are defined on the order form, so it would not be necessary for CC/ACH to be disabled.