I have been researching Edward Harrigan and his partner Tony Hart for the past 40 years (as well as performing Harrigan material). I have never come across "Dunderbeck" or any of it's variants associated with Harrigan. It is true Harrigan sang a few "Dutch" comedy numbers early in his career (like "Little Fraud") but nothing I have seen so far like "Dunderbeck". It is quite possible that the lyrics turned up in the one of many early Harrigan and Hart songsters. The songsters usually contained a number of songs that were not sung by Harrigan. No doubt included as "filler".