Most shops much prefer to use new spokes. It offers them a much better chance to guarantee their work and it's faster to build with new stuff. For any bike that's actually been ridden, there'll be a signifiant number of nipples that'll resist turning quite vigorously.
And if you're getting a new rim, it's anybody's guess whether the measurements of that rim will work together with your old spokes anyhow.
If you're paying for the work, pay for the spokes too.

ANd while SS/IGH bikes do wear sprockets rather slowly, you'll probably need a couple of extra links anyhow. Good time to splurge on a new chain, they're not expensive.