I would personally recommend Higgins Sunburst, and Harlan Teklad 8640. I can help you calculate the correct ratio to ensure whole nutrition.
I'm happy to help people figure out proper mixes based on what is available in the USA and Canada, as nutrition is something I'm quite interested in.
Keep in mind that while dwarfs may be diabetic prone, fruit and sugar will not inherently cause diabetes... everything in moderation. Diabetes, for the most part, is genetically linked, with only a small amount related to obesity.
https://www.amazon.com/Higgins-Sunbu...ggins+sunburst
https://www.amazon.com/Rodents-Compl...an+teklad+8640