Living in Japan with a Japanese Citizen, but I will be a tourist for the long term

I am married to a Japanese citizen.

When we move to Japan for good, I do not plan to work. I will be retired and paying for my living costs via withdrawing 4% from my investments as per the FIRE plans you read often on Reddit/the internet.

I am a UK passport holder.

I understand there is a option to become a Japanese resident, since I am a spouse, but then I will be subject to taxes on my realized investment gains to pay for my living costs.

Is it feasible and/or possible to stay in Japan for 88 days (90 days is the visa limit) as a tourist, then leave Japan to go on trip for 3 to 5 days, and then re-enter Japan again as tourist, as long as I am physically able to, since I will be aging?

Or will at some point – the immigration officer will not allow me back in as I am doing a “visa run”

Are there any benefits I am missing out on, for example healthcare in Japan, since I am not registering as a resident?

Thank you