Juminhyou and residency check

A bit of background, I am a PR and have investments with rakuten shoken. I quit my job in July 2025 to travel around the world and deregistered from the juminhyou to stop paying for health insurance and pension. Whilst overseas they locked my account because they sent mail to my old address to confirm my residency and I failed to return the mail.

Has anyone been in this situation and what information do they request for? Do they request for a juminhyou certificate? If so, that would mean I'd need to register a new address (a friend's house) and join back into the pension and public healthcare system. Complete the residency check and then opt out of the pension and healthcare system before travelling again next year. It's a real pain in the butt. Any advice?

by thelyt