Doughnuts preseratives Calcium Propionate

I normally use calcium propionate for extended shelf life problems. I am a packed doughnuts manufacturer, and I have a problem managing my shelf life. Regarding mold on our product, I need some halal/vegan preservatives to extend my shelf life from 3-10 days. I am using yeast, baking powder, eggs, salt, and butter as an ingredients. Some authentic solutions would be highly appreciated.
I have experience with a few natural options such as Bred-Mate, Bro-Lite and MoisturLok, but I doubt that any of those will get you as much shelf life as calpro will. MoisturLok and Brolite both have formulations for sweet goods, and I did have luck getting yeast breads to have a 7+-day shelf life with Bro-Lite. 
If you have access to it, I'd recommend just getting halal calpro, as that's going to have the longest shelf-life by far.