You could remove one spoke, measure it, then buy a few (plus a few extras). Replace them and true the wheel. There's probably no "dish" on the wheel, and there are lots of videos to help do the repair.
Having said that, rebuilding a wheel like this isn't terribly difficult. I've successfully rebuilt several wheels with internally-geared hubs. It's quite satisfying to ride around on a wheel you built yourself. And the labor is all your own!
First wheel re-build. New rim, old spokes.