Hide the membership pricing box on Sitewide Sales Landing Page checkout form and replace with our own.

maybe_add_choose_level_section_swsales.php

<?php
/**
 * Hide the membership pricing box on Landing Page checkout form and replace with our own.
 *
 * Requires Paid Memberships Pro and Sitewide Sales.
 *
 */
function maybe_add_choose_level_section_swsales( $include_pricing_fields ) {
    global $wpdb, $pmpro_level;

    // Make sure Sitewide Sales is active.
    if ( ! class_exists( 'Sitewide_Sales\classes\SWSales_Settings' ) ) {
        return $include_pricing_fields;
    }

    // Hide the default pricing box.
    if ( Sitewide_Sales\classes\SWSales_Settings::is_active_sitewide_sale_landing_page() ) {
        $include_pricing_fields = false;
    }

    // Show our own radio select and info.
    ?>
    <div id="pmpro_levels_select" class="pmpro_checkout">
        <h3><span class="pmpro_checkout-h3-name">Select a Level</span></h3>
        <div class="pmpro_checkout-fields">
            <div style="cursor: pointer;" onclick="jQuery('#levelradio1').prop('checked', true);">
                <p>
                    <input id="levelradio1" type="radio" name="level" value="1" <?php checked( $pmpro_level->id, 1); ?> />
                    <strong>Level 1 Name:</strong> <strike class="muted">$97</strike> $47<br />
	                About the level 1 membership.
                </p>
            </div>
            <div style="cursor: pointer;" onclick="jQuery('#levelradio2').prop('checked', true);">
                <p>
                    <input id="levelradio2" type="radio" name="level" value="2" <?php checked( $pmpro_level->id, 2); ?> />
                    <strong>Level 2 Name:</strong> <strike class="muted">$197</strike> $97<br />
	                About the level 2 membership.
                </p>
            </div>
        </div>
    </div>
    <?php

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