Broody Cream Legbar - Anyone have experience letting them try to hatch?

We had an incredibly fruitful hatch a couple of weeks ago and I have some previously ordered hatching eggs coming this week that we don’t need to hatch since we have enough.

We’ve been trying to get our little silkie girl to go broody, but she’s still kinda young. In the meantime our cream legbar has decided she’s just gonna start trying to hatch right in the only nesting box the rest of the flock lays in.

Anybody have experience letting a cream legbar hen just go for it? I’ve read that they’re less prone to broodiness.

Yesterday we tried moving her and the (probably) unfertilized clutch to a wire cage broody setup to get her out of the main nesting box to limit complications from the hens dumping too many eggs there, but she wouldn’t take to it, threw a huge fit, and didn’t get back on the clutch until mid morning today.

We plan on swapping in fertilized silkie eggs tomorrow night and I think right now my two biggest concerns are her quitting the clutch when we do the swap and keeping the other hens from laying in that box (which seems logistically impossible or extremely difficult given the layout). Any tips?