Frieza will probably say no to your second question. He said no to me becoming a Namekian from a Saiyan, due to changing from Temporary to Permanent. It would make it extremely unfair for you to change. eg.
I am at 357,000 PL now, and when I wanted to change to a Namekian, I worked out that if I used all the Trans that were available for my PL at the time, I would jump to 14 million. And since Androids have a few extra transformations to the Namekians, you with an extra 400k PL would make you easily into the near 20 million.