So there is 2 things I hear about this. IDK however I am going to tell you what I keep reading. If you incubate your chams correctly and do not try to speed hatch them. They can eat dubia babies day 1, or 1/8 crickets. If you speed hatch and have your babies in 5-6 months than ya you are going to need very small feeders. I have read quite a bit from some experienced breeders that speed hatching is bad, let them take the full year to hatch.
Hopefully someone with experience in both can chime in with that.
Anyway, I have been reading about this a bunch.
So here is the list I decided on to feed my babies if and when I start breeding.
Fruitflies,
Confused Flower Beetles,
Silks+supers,
(not sure about these, I hear there is issues if you house the babies together, my babies will each get there own cage so its no effect to me, but may be to you)
Bean Beetles,
Buffalo Beetles,
Baby Repti worms (up in the air about these ones),
Isopods (some of the small tropical ones)
And the finale the stunner
Kenyan Roaches, these little dudes only get to 3/8 inch full grow breed like crazy and are just like breeding dubia but way smaller, they also have soft shells all the benefits of roaches and the babys are smaller than Pinheads, the newborns are the size of FFs. These guys seem to be uncommon feeders for our hobby (in all herp keeping not just chams). I guess not enough people know about these little gems

. Ig uess its partly as they are a 1 feeder roach, they are the smallest feeder roach available. And while adults can reach 3/8s, from what I have read most of the time they do not get bigger than 1/4 or so. So they really are a baby only food, where as Lateralis breeds faster and can be fed to adult chams.
With all that I planned to buy maybe 1k pinheads to add some more variety and a mantis ooth, for each clutch. As the babies get biger I will mix in Dubias and GBRs.
Another option instead of keynans. Is B. Lateralis, these are the fastest breeding feeder roach (Or anything that I know of, they technically breed slower than Crix, however you can keep more of them in the same size enclosure than crickets so in turn it will seem faster) there is. The babies are same size as Pins, with the nutrition of a roach and no smell of a cricket.
WARNING: These guys will infest and breed in your house. No matter where you live, if you let some get out you will have an infestation. I even know people that swear they never let any out and still got infested, and they are very fast!
Some people will claim they wont, but I have been told from people I trust they 100% will and can even live through a snow. For this reason I decided to go with kenyans, which do not breed as fast and can climb but wont infest. Since Kenyans wont really be fed off except to babies you have plenty of time to get a huge colony going just for breeding year round. So you have been warned
they will work but the consequences could be bad.
EDIT: Ahh dang, I missed the Florida part, kenyan roaches are not legal there. Nor are red runners.
Honestly you are stuck with crickets. Nothing will breed fast enough to replace crickets that is legal in your state. All the beetles breed fast, and if you had a diet of 40% supers and silks (10% supers 30% silkies), then you could likely pull off using beetles and flys the rest of the time.
However again someone needs to chime in with experience however I have read numerous times that feeding worms to babies that share a cage will end in nipped tails. Those were good breeders that said that, though I dont know as I have seen others say that has never happened to them.