Hide the PMPro pricing box at checkout using the new pmpro_include_pricing_fields filter.

override_pricing_fields_on_sitewide_sales_pages.php

/**
 * Hide the PMPro pricing box at checkout
 * and replace with our own.
 *
 * Require PMPro v1.9.5.6+ and PMPro Sitewide Sales v1.0+
 * Add this into a custom plugin.
 */
function override_pricing_fields_on_sitewide_sales_pages( $include_pricing_fields ) {
	global $wpdb, $pmpro_level;

	// Make sure PMPro SWS is active.
	if( ! class_exists( 'PMPro_Sitewide_Sales\includes\classes\PMPro_SWS_Settings' ) ) {
		return $include_pricing_fields;
	}

	// Hide the default pricing box.
	if( PMPro_Sitewide_Sales\includes\classes\PMPro_SWS_Settings::is_active_sitewide_sale_landing_page() ) {
		$include_pricing_fields = false;
	
		// Show our own radio select and info/ect
		?>
		<div><p>Insert your custom level select or pricing info here.</p></div>
		<?php
	}

	return $include_pricing_fields;
}
add_filter( 'pmpro_include_pricing_fields', 'override_pricing_fields_on_sitewide_sales_pages' );