Between farsports (FS) and light-bicycle (LB): whatever you choose, you cant go wrong with both of them. I believe LB has a bit more high-end options with their flyweight rims, but since the price of FS is unbeatable, I often end up with them. They just offer a large variety of excellent rims (and wheels). I'm using their gravel rims for 2-3 years now on all sorts of terrain and so far they have been indestructible.
Last black friday, I ordered a FS wheelset for a friend similar to the ones I'm using:RD261 hubs, Pillar 1420 spokes, alloy nipples and fs50/30g hookless gravel rims -> 1350gr -> 800EUR incl shipping because of their Black Friday deal. Those hubs are similar to the DT swiss style hubs with similar freehub system.
On the chainring size: likely since I used a 2X spider and installed it on the outer ring to make it 1X, you can go easily up to 50T. If you would use a 1X specific crankset, the chainring ends up in the middle of where a small and large chainring would come, so I imagine the space is less.
