Comment puis-je supprimer efficacement les signes diacritiques des chaînes Unicode en Java ?

public static final Pattern DIACRITICS_AND_FRIENDS = Pattern.compile("[\p{InCombiningDiacriticalMarks}\p{IsLm}\p{IsSk}\u0591-\u05C7]+");

private static String stripDiacritics(String str) {
    str = Normalizer.normalize(str, Normalizer.Form.NFD);
    str = DIACRITICS_AND_FRIENDS.matcher(str).replaceAll("");
    return str;
}

stripDiacritics("Björn")  = Bjorn

public static final char DEFAULT_REPLACE_CHAR = '-';
public static final String DEFAULT_REPLACE = String.valueOf(DEFAULT_REPLACE_CHAR);
private static final ImmutableMap<String, String> NONDIACRITICS = ImmutableMap.<String, String>builder()
        // ... [List of non-diacritic characters]

public static String simplifiedString(String orig) {
    String str = orig;
    if (str == null) {
        return null;
    }
    str = stripDiacritics(str);
    str = stripNonDiacritics(str);
    if (str.length() == 0) {
        // ... 
    }
    return str.toLowerCase();
}

// ... [Continued implementation]