I've had to assist-feed a few babies. Sometimes when it swallows you can "train" a second feeder behind the first; basically as the back end of the first feeder is disappearing you sneak the head of feeder #2 into the snake's mouth. This is absolutely not power feeding, as the combined weight of the two feeders would be an appropriately-sized meal. With the OP's snakes weighing in at 80 and 100 grams, each of the two feeders would be 6-8 grams.
So, for these snakes that are only eating live, I would start with a live feeder and train the f/t behind it. Eventually the snake will figure out that f/t feeders are food and you won't need to use live any more.
An alternative to using a live feeder to start the assist-feeding process is to use the hind leg cut from a f/t feeder. You put the leg in hock-first so it's folded in half, with the cut end and the toes pointed out of the snake's mouth. You need to have it sized so that it's easy for the snake to swallow but hard for it to spit out; the leg will want to unfold and it gets stuck in the snake's teeth fairly easily. Then you train a whole-prey f/t feeder behind that.
If/when to cull is an ethical decision that only you can make.
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