Little and often. Every 3-4 hours at this age. I've always found that if you feed them (kids/lambs) often enough, you can let them take what they want.
Are you milking Simone and Aisha? If you can put up with less milk, having one of them do the job for you id probably better all round.
Here is what happened to me, raising Daisy's twins after she died.
For several days, catch goat kid, pin it under arm whilst trying to feed it. Had to put teat in mouth, resisted, spat, wriggled, very fraught.....
Put Ellie (whom I'd 'milked through' that year , so no kids of her own) on milk stand, tried to let kid suckle. Had to hobble Ellie, who kicked, did handstands, very fraught.....
About day 5, caught one goat kid, started the milk-bottle struggle........turned round for the next one, to find Ellie feeding him. Let go of the one I had, who ran straight to Ellie and she fed her too.
After that, she adopted them and the whole thing was sooooooo much easier and nicer.
These kids, in their orphan days, slept out in the goat byre, but behind a mesh partition that was a couple of feet high. The adults could sniff the babies over it, but not actually stand on them or headbutt them.
Once they were Ellie's they were in her pen overnight and loose with everyone during the day.