Kokumin nenkin kikin or Fuka nenkin for Americans

Any Americans working freelance increasing their pension and reducing taxable income via Kokumin nenkin kikin or Fuka nenkin? Do I just go to the pension office to set it up? Would it be worth it for the tax savings and increase in pension? NOTES: I'm PR and probably staying here until retirement, though I could leave if things got really bad here… I contribute 16,000 yen/month for pension now but could do more. IF I got a job later and switched to company pension, I guess whatever extra contributions I made via Kokumin nenkin kikin would contribute to my overall receipt at age 65? If I set it up then couldn't pay, would it be possible to reduce it? Lots of questions about the logistics of contributing to something like this. (I've given up on iDeco because of PFIC issue. I know that's controversial.)

by JPcoolstar