I have worked with ferals before, a feral had three kittens under my back porch. We couldn't take care of them so we gave them to the humane Society.
At first they wouldn't let me touch them, but then gradually, they came out to play with some leaves, (you can use toys), and because I was on the porch, they could not see me, I gently grabbed them from behind, and softly petted them and put them with their mom in the cage.
Being on your bed might work using some toys that are long or that hang from some sort of string. Hang the toy down so that all the kitten can see is just the toy, not you. Once the kitten comes from under the bed you can gently take him.
Sound like everything is going well so far! Good luck!
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