OK. Lot's of issues. First, many bees seem reluctant to cross an excluder and build out foundation. I've always struggled with that and with plastic in particular. Putting a frame or two of brood up top seems to help but since you're deep down below and shallow up to, it won't work too well. You could consider pulling your excluders and see what happens. As a last resort, you could try putting your shallow on the bottom if you don't mind brood. You can always swap it back later and you'll have the benefit of pulled wax.
If you're in a dearth, they'll have little reason to pull wax no matter where they are in the hive. Since new bees are still coming out of cells and leaving space for the queen to lay, they don't perceive space to be a problem. If you're honey (or syrup) bound, that's a different problem and the shallow super would be needed. The queen may have slowed down if there is a dearth so, again, they don't see the need to pull wax.
Bees on the ground is never great unless it's someone else's swarm that you've found! Where is your queen? Is she in that ball of bees on the ground? Is there any queen in those bees? I've had queens run outside and found them because of a bunch of bees where there wasn't supposed to be any. Was your original queen marked? More important, was she clipped? Could your hive have superseded your old queen, thrown a swarm and your clipped queen is on the ground being attended to?
No telling if the bees will take to their new home. If it's truly a swarm (and I don't think it is), they may want to be elsewhere. My guess is that you've got a queen and a bunch of bees that came from one of your hives. She may even have been superseded. I would start by checking the existing hives while your ball of bees hangs out under your boxes. Then, you can decide what to do. If it turns out that you have a queen in each hive AND in the ball of bees, you could bank the ground queen and shake the others into a hive of your choice. Keep the banked queen until you're sure that both of the other queens are laying and then do what you will with her.
"My wife always wanted girls. Just not thousands and thousands of them......"