That is a very nice upgrade offer. I think
@wanderlust7 has this all covered for you, and I would agree that applying for the Plat first is how I would go too. I didn't know about the pop-up for support link vs no support link situation, so if that 150K offer thru FrequentMiler still gets you a pop-up, then try the Resy offer. If you got all of that to stack together you'd have 225K-250K MRs (plus 12K MRs from spend) which is more than enough to get you two roundtrip award business flights on ANA to Japan from the US. Note that in the US, award tix have to be out of cities that ANA services: Chicago, Houston, LA, NYC, San Francisco, San Jose, Seattle, Honolulu, or Wash DC. This
link gives more detail about the routes and type of planes. Depending where you live you may need a positioning flight too.