This setup is going to be a problem to matter what you have on your eyes. Goggles fog up easier than glasses when your body is hot from riding. This biggest problem is that you have the gaiter over your nose. This makes the air go up under your glasses when you exhale.

Try this and see if it works. Take an old pair of glasses (best if they have large lenses) and remove the folding ear braces or whatever they are called, so you have only the lenses in the front frame. Put this inside your goggles to act as a prescription insert. If you don't have to wear glasses just don't do this.

Wear the neck gaiter over your chin but with your mouth and nose exposed so you are not breathing into the gaiter. The foam on the goggle will keep the top of your nose warm and you will be able to take some cold on your mouth and upper lip as long as your head and body is warm and it is not too cold. You should be good down to -5F or so. Don't remove the foam around the outside of the goggles because if you do and your riding in the snow it will go inside your goggles and they will get fogged up no matter what else yo have done. The most important thing you have to remember is to keep your breath from going into your glasses or goggles.

If you are really hot goggles may fog up when you stop and there is no air moving around them. They will unfog in a few minutes of riding.

If you have to keep your nose and mouth covered you are going to have greater problems keeping you glasses or goggles unfogged.

Search the forums. Some guys have used neoprene face masks with the mouth area cut open and some kind of a respirator on to redirect breath with good success.