I’ve never come across a jacket with the same exaggerated ducktail design of the Filo – they should have called it the Alpkit Platypus – before or since. I think Patagonia does a kids’ down sweater that’s ‘droptail’, but it’s far less extreme and, I’m guessing, you’re an adult anyway. Your best bet, if you really like the whole platypus vibe, would probably be to set up a saved search on eBay and get a lightly used one on there. Fwiw, I like the cut of ME’s insulated stuff, it tends to be quite fitted compared to a lot of brands.
If you’re minted, PH Designs could probably make you whatever you want – they manufacture in Stalybridge – and it will use amazing down, but it won’t be cheap.