Sansei visa working remotely for a foreign company

Hey,

I’m a Brazilian-Japanese in my 30s. My grandmother was a Japanese citizen, my parents are Brazilian, and I was born in Japan, but we moved back to Brazil when I was a child.

I currently work remotely in tech as a contractor for an American company, and I’d like to move to Japan without changing jobs. I want to keep my current work arrangement.

Can I apply for the sansei long-term resident visa even if I don’t plan to work for a Japanese company? My idea is to move to Japan with this visa, then set up my own company there to provide services as a contractor and pay taxes in Japan. I have an aunt in Japan who could sign the Certificate of Eligibility—would that be enough for the application?

Aside from the digital nomad visa (which only allows a 6-month stay), is there any other visa option that fits my situation?

Thanks for your help!