OH man! I am mess today, sorry.
If you need to bring keets inside and then in a day or so you want to reunite them with the hen, well some do it differently. I plan to add keets to the newly hatched flock during the night. So far my broody chickens have accepted everything I have done so far, I...
If you are keeping the keets with a chicken then that is different than letting a guinea hen mother them. If you research guineas in their native habitat it is much different than here in the US. Guinea hen knows instinctively how raise her keets in her native habitat. Chickens on the other hand...
If you are wanting them to be raised with the flock then leave them with the flock. You may have to keep the flock penned up with them for several weeks until they are big enough to tolerate the tall wet weeds and avoid predation.
Good luck.