We're not sure why we didn't think of this sooner.
In microwave-safe bowl, melt two-thirds of chocolate in microwave in 20-to 30-second bursts, stirring often. Whisk in remaining chocolate. Dip chips halfway in chocolate. Transfer to parchment-lined baking sheet. Sprinkle with pretzels, nuts, or sea salt. Let rest until set, 1 hour.