Re: "standard" bees on 4.9 foundation
Probably a first, but I'm with Solomon on that.
Also, if you want small cell bees, you'll need to get rid of the combs that came with the nuc, or at least keep them out of the brood nest. Otherwise they will be an on going source of large bees, that will always be trying to build bigger cells.
Here's how I would do it (and have done it). Put the nucs in your hives. Fill the rest of the hive with sc comb taken from your sc hives, preferably that has had brood in it at some stage, so there are cocoons in the cells to stop the bees enlarging the cells. If you take them from the sc hives, replace them with frames of foundation that the sc hives can draw.
In the new hives, remove any large cell combs that do not have brood, and work the combs that do have brood to the outside of the broodnest with a view to eventually removing them. You want to get rid of them as soon as possible, so once there is brood in some of the sc combs, provided there are enough bees, put the lc brood combs in a second box over an excluder, with the queen below. Once brood is hatched remove the lc combs.
Do not let the new hives draw comb till all the old lc cell bees have died, or they will mess it up. Instead, give them drawn combs taken from the sc hives and feed foundation into the sc hives instead of the new hives with lc bees.
"We don't need no education" (Pink Floyd) - Yes you do, you just used a double negative.