I think we're going to end up wanting to use checkboxes instead of radio buttons. A group of radio buttons only allow one radio to be selected, and even if each radio button were put in its own group, respondents would have no way to deselect it after clicking. I could write the code to handle the behavior between the numeric fields and checkboxes, but this work has already been done in "Not Applicable: Per Variable" in the Community Question Library. You can download and import this question into your local Lighthouse Studio from here:
Hopefully the instructions on that page will help you get started using this tool, but I'd be happy to answer any questions that might come up from using it.