I am a bit late to the party but one piece gliders can absolutely swim like a 2 piece glider. My glides swim with a nice S-pattern and the fall perfectly horizontal with a shimmy. Because they sink perfectly horizontal with a slow fall, they will sink to the bottom and stand on their hooks without falling over. Making the belly thinner than the top and putting the weight as low as you can gives you a very strong shimmy on the fall. I won a fair amount of money with these baits in tournaments. Smallmouths in crystal clear water love them and will come up from 20 feet to get them.
I also found this that might be used as a reference.
Bulletproof Glide Desenho e modelos Bait | Homemade fishing lures, Custom fishing lure, Fishing bait (pinterest.com.mx)