Staying invested after leaving Japan

Wish everyone a happy new year!

I have an account with Rakuten securities. In a hypothetical siutation, if I were to leave Japan, I wanted to better understand the departure procedures they have in the FAQ page. The goal is to avoid force selling the investments that would otherwise create an unnecessarty taxable event. I'd like to stay invested for the long term.

Q1. They talk about appointing a standing proxy. Can it be a friend? Does it matter if they are a Japanese citizen or not?

Q2. For foreign stocks/ETFs, they say holdings is possible but transaction is not (not even selling). Does that mean 10 years down the line, I cannot even sell it? Will I have to come back to Japan to sell it? Which visa would I require?

Q3. For investment trusts (such as Rakuten S&P500 fund), the situation seems much simpler as selling is always allowed. So I can do it even if I'm not back to Japan. Is that right?

Relevant portion of the Rakuten securities FAQ page (translated)

Thanks

by idder_moc