I'm just going to warn on this, because I don't want anyone to experience what I did when I slacked on the dusting:

DO NOT SLACK ON THE DUSTING!!!

I did, and my Green frog (Rana Clamitans) nearly developed Metabolic Bone Deficiency. Even though I stopped it in time, her immune system severly weakened, and she must've had some Giardia (Parasitic Protozoa) in her system, because soon after she became lethargic due to it, and developed a full-on infestation of Giardia, which prettymuch stole the food she should've been getting. As I was treating her for Giardia, I also had to fight off Tetany (Lack of calcium = weakness, lack of hopping, can lead to MBD) at the same time. In total, it took me 2 months to fully cure her. It was a very horrible experience, I had to forcefeed her every night for about 6 weeks, and keep her in a small, 5 gallon quarantine tank. We both hated the entire experience, and I don't want anyone else or any other frog to ever have to experience what me and Bumpy did.

As for the lack of Vitamin D3 in the dusting, as long as you've a UVB light, you'll be fine without the Vitamin D3 in the dusting.

Also, as for the problem with Red Wrigglers, you may want to try looking around a website, store, or even your garden for Nightcrawlers. They're larger, typically paler, and much more nutritious than Red Wrigglers. Just make sure you get them from a additive/fertilizer/pesticide free source. I can typically tell Red Wriggler from Nightcrawler due to size, color, and if they produce a foul scent or not. You can try wiggling them in front of your frogs face to encourage him/her to eat them, either with your hands or a pair of tongs.