I had problems with a very old female lovebird that I added to my finch/canary aviary. I thought because of her age she wouldn't bother with them (She just liked to walk around on the floor.. needed a hard surface) She acted aggressively and I removed her right away.. didn't want to risk her being unsupervised with them..
What kind of polish chickens ? Just surprised to hear that because the ones I've seen are quite large, even the bantams. I had a few big haired polish bantams, they free ranged and were a lot of fun.
I have always been warned by my vet not to mix poultry with parrots/smaller birds, because of risk of disease. They wouldn't have the same immunity to disease as the wild birds that would come in contact with your chickens. I've seen some quail in the petstore bird rooms but I assume they were raised in a sterile environment and immunized.. or something.
I would also worry about them because if someone fell to the floor and was injured the chickens would probably eat em'. I've seen them do that to other chickens! Cannibals!
I would choose either the hookbills or softbills. Even if it is just fighting over territory, it would be very stressful for them. I would think they'd be healthier, livelier and more entertaining to watch if kept safe within a flock of their own kind. (they'd feel safe enough to relax a little)
Looks really nice so far! I wish Iit was warm enough now to let my guys play outside!
Only thing I would suggest is adding more nest boxes. I always made sure to have more boxes than birds/pairs of birds, that way they could be picky and not have as many reasons to fight

Good luck with your aviary!!