It’s called Walker (1987). Directed by Alex Cox (Repo Man) and starring Ed Harris. Not currently streaming anywhere I know of, but if you can find it on DVD or something I highly recommend it. The less you know going in the better. :)

a worldbuilding game such as the quiet year, for the queen or microscope, hacked to set up a concise and thematic noir mystery inspired by fiction like Disco Elysium, The City and the City or The Nice Guys

That sounds amazing. I love the thought of a Nice Guys-inspired campaign setting.

Is the game you’d like to run also Lancer? That would be a wild coincidence.

Edit: Oops, nevermind, I just saw your other comment!

Electric Bastionland has been the RPG I most want to run ever since I bought it years ago.

After watching a surreal Acid Western (which started out deceptively straightforward and veered endearingly off the rails by the final act), I’m itching to run In The Light of the Setting Sun: Bonanza Edition. But I’m at the end of my current FIST: Ultra Edition campaign and don’t want to rush anything. :D

Tricube Tales. It’s the easiest game I’ve run, and strikes a perfect balance between rules lite narrative shenanigans and a traditional roleplaying game. Uses an easy to manage 1-3 pool of d6s, and all the GM has to do is pick a Trait (Agile/Brawny/Crafty) and assign a difficulty to the challenge (most of the time it’s 5). Character creation is pretty freeform, with PCs getting Fate aspect-style Perks and Quirks. You can run just about anything in Tricube Tales. It’s a real joy.

I’m also big into FIST ULTRA Edition, a game about paranormal mercenaries set during the cold war. Inspired by Metal Gear Solid and Doom Patrol, FIST is based on World of Dungeons, so it’s a 2d6 system, sort of like PbtA with only a “defy danger” move. The heart and soul of the game are the 200+ Traits, which are a sort of combination half-class, feat, starting gear, and attribute score adjustment. When you make your mercenary, you get to pick two Traits, and the ensuing combination is always fun.