Disable "Remove" in Payment Field

I would like to use the Stripe Payment field to provide a way for my customers to oder a free sample of my product. I have created a single product and defined that it is "required" and "should be added by default". 

Is there a way I can disable the "remove" button so that the client can't modify the product listing before submitting the form.

Thanks,

Peter

Remove button is disabled when the product is set as Required and Selected by Default.

I tested this with Stripe payment and it is working fine. The product can't be unselected.

Demo: https://form.jotform.com/82411636679969