Template wildcard data type, normalizer/analyzer for case insensitive search

I have a data ingest that contains user input and want to wildcard search it. But I need the search to be case insensitive.

"normalizer": {
    "lowercase_normalizer": {
      "type": "custom",
      "char_filter": [],
      "filter": ["lowercase"]

So I used to have this normalizer in place on a "keyword" field but that is really slow compared to the new 'wildcard' data type (allegedly).

        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "normalizer": "lowercase_normalizer"
          "wildcard": {
            "type": "wildcard",
            "normalizer": "lowercase_normalizer"

The above however returns an error because normalizers aren't allowed in wildcard data types.
Any suggestions for how to lowercase, wildcard search using the wildcard datatype?

Question answered here:

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