Have you tried Dubia roaches? Much higher in protein, can't climb smooth container walls, don't smell, not very fast, easy to gut-load with calcium-rich veggies and fruit. You could hand feed with tongs or just hold the roach by the sides of its shell. I usually put some of appropriate size in a small feeder cup, hold it in my hand, and offer it to my chams. Works great and now they come clambering when they see the cup, often hold onto my hand when feeding and walk all over me when done eating.