I can see the appeal of a nice light wheelset with a dynamo, I’m tempted to rob the dynamo front wheel off my SSCX bike for the road bike over the winter. But I’d be wary of picking the lightest option, if they’re all the same/similar hubs then saving that much weight in the rim is a false economy the first time you prang it into a pothole on a dark country lane.
FWIW my shimano XT hub and DT-R460 rim +32 spokes came to <£150. And the shimano hub is within a gnats chuff of the SON28 hub weight (i.e. really heavy at around 480g each, but not actually heavier which surprised me).
Or to put it another way, Shimano hubs, DT rims*, and spend the change on 2x 5 day breaks to somewhere warm and sunny for “training camps” working on your tan lines.
*I’ve got R460’s, someone else recommended a slightly different but still ~£30 one last time the subject of budget gravel rims came up.