cached files after switch theme

Hi,
Do you think there is a way to address correct cached files after theme switch:

add_action( 'setup_theme', 'switch_user_theme' );
function switch_user_theme() {
    if ( in_array( wp_get_current_user()->ID, array( 5 ) ) ) {
         $user_theme = 'fezforprez';
         add_filter( 'template', create_function( '$t', 'return "' . $user_theme . '";' ) );
         add_filter( 'stylesheet', create_function( '$s', 'return "' . $user_theme . '";' ) );
    }
}

https://www.ads-software.com/plugins/minipress/

This works, but not with minipress, ??