For and Omega Set you need 4 Chips from 4 Different Zones. These Zone are also pretty easy to clear. I have Personally clear everyone of them with 9 People. Hell we have even beat some of the Really easy ones with a Single Party.
This is proof it can be done. If you have 18 people doing this twice a week, you can farm an entire Omega set in a single week.
Something like this is just what I need to get me interested in Limbus again. What are the chances we could try out a method like this?
The basic idea would be to ignore all treasure chests and only go after time extension chests, and also dodge all mobs including the bosses of each floor, once the vortex pops. That means no fighting Fafnir, no fighting Aspid, etc. Only hard part is the logistics of having the same person get both chips, but even that should be fairly easy I think.