A terrible WDSUtil script I made up real quick in Go (FYI, I don't know how to use Go at the moment... so this is mostly a learning experiment.) to set the boot program.

wdsutil_boot_prog.go

package main

import (
    "os"
    "os/exec"
    "log"
    "fmt"
)

func main() {

    if len(os.Args) < 4 {
        println("Invalid number of arguments, we need the Device, ID and BootProgram.")
        return
    }

    // Looks for an exe (by string name) in your system's path.
    path, err := exec.LookPath("wdsutil")

    if err != nil {
        log.Fatal("WDSUtil is not found dawg!")
    }

    if len(path) > 0 {
        // This is because the compile is pedantic... blarg!
    }

    cmd_device    := fmt.Sprintf("/Device:%s", os.Args[1])
    cmd_id        := fmt.Sprintf("/ID:%s", os.Args[2])
    cmd_boot_prog := fmt.Sprintf("/BootProgram:%s", os.Args[3])

    cmd := exec.Command("wdsutil",
                        "/Set-Device", 
                        cmd_device, 
                        cmd_id,
                        cmd_boot_prog)

    out, err := cmd.Output()

    if err != nil {
        println(err.Error())
        return
    }

    if out != nil {
        // Stuff...
    }
    
}