Uh-ooh. I'm sure this will open a can of worms.

VERY testy subjects for TOO many folks.
Oled, I have the same dilemma each and every year. My birds LOVE the outdoors, and neither will wear a harness. I do the exact same thing you do. I let their flights grow in as soon as it starts getting chilly outside, and once the weather is warm again I trim them so they can enjoy the garden with me.
I've been doing this with Hunter for the 13 years I've had her, and NEVER had any problems.
....I will duck now..as I'm certain the "battle" will begin....