What has the rim to do with the hub? Choose another hub and everything is fine.

The video only shows how to install the ball bearings. But what about removing them?

ceramic bearings make no sense. Don't buy them. Even a ceramic bearing can rust, since the bearing shells are made of steel. Steel bearing is also fine. As long as you use enough greace, everything is perfect also with steel bearings. Most of the wheelssets have nearly no greace. Therefore directly after you receive them, apply more greace under the end caps. Then you will have less problems in winter time.

For 30/32mm tires I would also prefer 24/25 inner wide. 

There are some rims from Serenade with 24mm, see picture. Than you need light hubs like SR268 and the CX-Ray. The external rotating mass must be as small as possible. So the rim is most important. Followed by the Spokes. Of course a carbon spoke is light, but it is hard to replace them. The CX Ray is a reliable and high-quality spoke.

On the website you can not see if the rims are hooked or hookless. Also the different hub models for the different wheelsets are not listed. And is there a catalog to download? Can I build my own wheelset? I think the website could be made a little more organized to answer the most important questions. That would also reduce the amount of time spent answering customers' constant questions.

The bearings and ratchet are usually shipped with only a small amount of grease. It is therefore recommended to apply a little more grease to the bearings and freewheel to prevent damage and rust. But that applies to all manufacturers.