Hi there,
One idea would be to disable the radio buttons, and store their default value in a hidden field of the same name.
This way your back-end logic need not change.
<input type='radio' name='val' value='Accepted' disabled='disabled' />
<input type='hidden' name='val' value='Accepted' />
Source: http://stackoverflow.com/questions/1953017/why-cant-radio-buttons-be-readonly