Good to hear journeyman. I do think that out of those species, the parent raised Rosella will have the most difficult time settling down in a home environment. Any of the grass parakeets (besides budgies) are pretty hard to tame even when hand raised. My mom has 2 species of Aussie grass parakeets and same thing, it took her a few YEARS to be able to have them step up. The Bourke's will step up to anyone but still prefers not being handled. The Princess keet will only step up to my mom for a brief moment to get to his cage. He is very wild as far as being touched, but he likes to come near me when I visit and talk and engage that way. This bird was handfed, but still even after years that is just the extent of his tameness. He IS tame, as in he doesn't freak out with humans, he just won't tolerate touching or getting too close to his body. With lots of consistency and time, you might get them all "a bit" tamer, but I wouldn't expect too much and I wouldn't get disappointed if they don't ever do exactly what you wish. I just told you about my mom's keets. She loves those boys and spoils them rotten and has ways of interacting with them even though they don't get on her and cuddle.
I believe that talking to them (like you would a dog or any animal) is beneficial. Even though we're a completely different species from birds, they still can sense vibes, emotion, and attempts at friendship from a different species of animal. Birds are incredibly intelligent too, and WILL pick up what your spoken words mean. 2 of my birds have learned commands without having to touch them. You'd be surprised with a little gentle consistency and talking to them, how birds will learn voice commands, especially along with hand gestures. When they do, either hand them a small treat, or if they won't take it, I've found that verbal praise is effective instead. Best of luck!
