I actually did something similar when my female was in a 1/2 gallon bowl and got sick with Velvet. I was a newbie and didn't know better for size, temperature and cleaning. But when she got sick and I was waiting to get a 5 gallon, I would change her 100% everyday without taking her out of her bowl. I wasn't acclimating, but water temp for her bowl and what was going in was room temp, and I would siphon out at the same time I was siphoning in. It worked really well, and didn't stress her out anymore than necessary.
But now that I have my 5 gallon, I just siphon out water, and pour new water in.