Possibly helpful:
Winning Unorthodox Openings by Angus Dunnington (2000)
https://web.archive.org/web/20140708234438/http://www.chesscafe.com/text/hansen15.txt
Searching for playable irregular opening
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Monie49 wrote:
Try Tennison Gambit
That seriously sucks. I actually don't think I have lost any game on chess.com when white plays that against my scandinavian. But I do have preparation on it.
bongcloud
Budapest Gambit.
If any irregular opening were any good it would not be classified as "irregular" ... it would be a main line ... or it would be waiting for someone to find new ideas in it and rehabilitate it ... which usually demands a high level of playing strength.
If, by some fluke, I ever manage to find new ideas in an irregular opening I am going to keep them to myself until I have won a few OTB games with them. I am certainly not going to give them away on this forum.
I suspect that your quest for recommendations will be fruitless. At best people will suggest lines that they have seen, but they won't have any new ideas to show, and the lines they ofer will be irregular for a reason ... they are inferior.
There is no good alternative to doing your own research.