If I have to put an excluder on and if I have mostly foundation going in the box above the excluder, I try to put a frame of comb in with the foundation. If you know where the queen is, you can pull a frame of brood (leaving the queen down below) and place that brood frame above the excluder. Keep it above the brood nest. Nurse bees will care for the brood and eventually all the brood will emerge. This has worked well for me in the past and, once the bees start working the foundation everything seems to go smoothly.
"My wife always wanted girls. Just not thousands and thousands of them......"