Made this this afternoon and it wasn’t until I got completely done that I realized I left out the wheat, dammit. Also it called for dark candi sugar so I found a website that told how to make your own, pretty cool and cheaper than buying it.
You can add the sugar as primary fermentation slows. I wouldn’t worry about trying to get the wheat in the beer.
I’ve tried several of those homemade candy sugar recipes and while several make good products that will add good flavor to your beer, none of them come close to the complexity of the commercial products.