Alpines would be a little bit on the flimsy side for a Covert, assuming the owner uses it in the intended fashion…
You can build a set of Flows onto something like a DT240, with a decent light spoke & get them to ~1750g, but if you push it hard you will notice more flex from having to use a light spoke such as a DT Revolution, and as a result they need a bit more looking after, as IME, they tend to develop a wobble a bit sooner & easier than with a bigger double butted spoke.
Tyres would be a good place to save a bit of chunk though. Weight & choice depend on how much hassle you want if you are running them tubeless. A good compromise might be something like a tubeless ready Hans Dampf, as they come in around ~750g, yet are a decent size, sidewalls arn’t too floppy & are easy to inflate tubeless.