Un-select radio option in upgrade area?

I've got 3 different subscriptions that are set so that they can't be selected at the same time, which displays the different subscriptions with a radio button.
And when the user selects one of these radio buttons it hides the other 2 subscriptions (which is what it should do based on the rules I have selected).

However, is there a way for the user to 'un-select' a radio option in that form?

So if they selected Subscription A (by clicking the radio button), but then change their mind and want to select Subscription B instead - it doesn't appear that they can do that.

Is there a 'rest form' option that I can add somehow? (other than just refreshing the page?)

Set them as non-exclusive, but keep the conditions. That should cover your usage as it allows unselecting. You can not unselect a radio.