A common complaint when building multi-floor factories is that freight elevators are too unwieldy for a single lane going one direction, but manually spiraling conveyors is both kinda ugly and very tedious.
So why not take inspiration from IRL spiral conveyors and make a "spiral" mode/piece that goes up 1-2 height at a time in a 3x3 footprint. It's still less throughput than a freight elevator that uses both directions or fully utilizes one direction, plus it can't dig its own path, but it could serve as a nice middle ground between raw belts and the full-blown elevator. (Note that part of the space savings is not needing loaders, so it saves a lot more room than the 3x3 size suggests.)
Attached a couple reference images.