If there is anybody still looking at finding an alternative for using commas in a csv lookup file, because they CAN'T use commas, because their fields contain commas, GOOD NEWS:
You can use quotes as text delimiters and commas as field delimiters in the following fashion:
"field1","field2"
"example1, that contains commas","something"
"example2",""
"","example3"
Splunk correctly extracts field value pairs!
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