Looks good. However, you shouldn't need POL_Wine_WaitExit after POL_Wine. POL_Wine_WaitBefore is good enough so long as running the program pauses execution of the script. Also, unless you've already submitted your script, you can't (as far as I know) tell what number to use with POL_SetupWindow_SetID. Oh---and many distros are still on Wine 1.6.2. Without using POL_Wine_PrefixCreate "1.8.2", you have no guarentee that it will behave the same way.
However, is this game different than the regular Wizard 101? If it's not, or if the script would probably work anyway for the other version, I'd suggest simply submitting this as a contribution to the above-linked script. (In that case, $POL_ID would be 1934)
I've adjusted the script and uploaded an update (https://www.playonmac.com/en/app-2808.html)
As you suggested, I removed the WaitExit command.
I tried with 1.6.2, but unfortunately the installer fails with some registry 64bit message :( So I set the version to 1.8.1 since that exists both on linux and mac.
As for the version: There are several publishers. The version I submitted a script for is the european version which uses different servers than the NA (existing) version. The game itself should not be much different, but the installer of course only works with the appropriate publisher.
Please approve my latest submission if possible. (I accidently did not add the script to the initial post, maybe you can fix this? https://www.playonmac.com/en/app-2808.html)