Believe the only way is by using CSS to hide parts of it. The duration is surrounded with the CSS class cbregTimeframe, the "for" with cbregFor, and the price with cbregRate. The button itself is surrounded by cpay_button_renew_wrapper CSS class. Example as follows would hide all 3.
Code:
.cpay_button_renew_wrapper .cbregTimeframe,
.cpay_button_renew_wrapper .cbregFor,
.cpay_button_renew_wrapper .cbregRate {
display: none !important;
}
You can add custom CSS to CB using CSS Overrides shown below.
www.joomlapolis.com/blog/kyle/18711-template-css-overrides-made-easy