It took me a few days, and about 6-8 total hours I think, but I managed to beat this RTA!
Hardest parts by far were figuring out how to kill the pokeys at the start, getting used to the downward clip with the double keys in the second level, the triangle clip followed by the underwater turn block clip in level 3 (which were the main struggles of this run, spent way too long trying to get a single triangle clip), and the final duck flight at the end of the first section of level 4.
As someone who loves keys, and especially loves flight, I thought this hack was an excellent challenge to see how far I could push both of those skills. Definitely think I could beat this again in a single sitting in the future, having now gone through it all. I'll need to splice together my level completions soon to demonstrate how I got through everything.