The only successful special projects I’ve ever seen are ones that are off the books initially, possibly even pissing off product managers or others because engineers essentially have to flippantly disregard the official prioritization of tasks according to non-engineers and just override it with what the engineer can easily see is actually more important from a genuine business/product perspective but can’t waste the time trying to jump through the hoops of political jockeying disingenuously asserted to be sincere evidence gathering to satisfy all the other competing interests and credit grabs.