blackcat, Auferstehen (Sabrina) is taming kittens for CAT77 and she works full time.
So long as you've got a spare room where you can isolate them from Smidgen and Esther, the rest is pretty basic. And I suspect you've got arrangements for feeding Smidgen and Esther that would serve for a pair of these kittens anyway...
I leave a radio in the room for Apache and Squaw when I'm not around. And I spend maybe 45 mins to an hour in total concentrating on them each day, playing, finger feeding, evntually handling - the rest of the time they are just getting used to the sights and sounds of living inside a home.
Have a chat with Sabrina if you like. Ask her about how you feel the first time you hear them purr....
If you think you could help us out for even a few weeks, it'll help.