Been trying to figure this issue out for the last few days as well…I think I got it.
Simply place the following hook at the bottom of your function.php
remove_action( 'woocommerce_proceed_to_checkout', 'woocommerce_button_proceed_to_checkout', 10);
That should do the trick. Below are Before and After shots…
Before
BEFORE
After
AFTER
kind regards,
soahkomplex