sS lambdaMapLike jreplace_multi_withModifier(IF1<O> modifier, S s, O... replacements) {
  if (empty(replacements)) ret s;
  if (modifier == null) ret jreplace_multi_gen(s, replacements);
  O[] a = new O[replacements.length];
  for i over a:
    a[i] = even(i) ? replacements[i] : modifier.get(replacements[i]);
  ret jreplace_multi_gen(s, a);
}

Began life as a copy of #1032146