they hate even the idea of a harnesses I got clark in one before I bought two different types, but she wasn't social, all she wanted to do was eat/destroy the harness. They are both so bonded I don't worry. I am afraid they might get lost outside though and not be abale to find me. So I usually clip in the spring/summer.
Keep up with the recall training and replace with a whistle. A whistle can be heard very far. Harness training is not as bad as you think. At first they always try to destroy the harness, but detract them by going outside and they will soon forget about chewing the harness up and after a few days they won't even notice it. Just remove when not watching them inside, or harness will be destroyed. It took my female U2 2 days to get use to the harness. She also can free fly, but don't want her to get into trouble in a public place as she like to fly off to get into stuff, so had to harness train her. My male U2 is way more behaved, even through he as well is fully harness trained, I don't need the harness for him as he listen and stays on my shoulder, or arm, but he was a outside bird and was free flying since a baby bird before I adopted him.
It funny with Cooper as he like to chew on curtains and he fly over to the curtain to chew it up and I call him, he come down and hiss at me a few times for making him stop.
I can't stress enough to harness train your bird, it is critical and might as well take advantage while your indoors for winter time. Just use bigger wing loop around head to get your bird use to letting harness on them and then put head in head loop and then under wings. It way more easy when you start looping the big loop around bird heads and off till they allow harness fully on. If your bird won't let harness anywhere near, hang it by cage at night, so they get use to seeing it and let them near and step on it. Yes a clipped bird can fly if windy outside and people lost birds more times that way then a free flying bird. Even a experience free flying bird can get lost as well, as I lost Baby my female U2 twice at first, but had GPS on her and heard her flock calling me, as soon as she saw me she flew back to me, another reason I harness trained her. Now she good at directions better then I am at times and doesn't get lost anymore, or scared of anything as she use to being outside during the summer and loud scary things. Just public unknown places I won't risk for liability reason, traffic and other people.
Even if your bird is fully harness trained, always inspect the harness, birds are very smart and my female U2 figured out how to get the leash part off which for her means she can fly again. She broken 2 of them completely and red one caught her in the act, I always have spares.
+ 
) are much better solution than clipping
