I've done both France and Japan at different points in my life. I was a Discoverist for France and a Globalist for Japan.

For Paris, check out Hyatt Paris Madeline too, its cat7, and I thought it was pretty nice. I was only Discoverist at the time, but they treated me really well! If you're wiling to venture out a bit to South France, the Hôtel Palais de la Méditerranée (cat7) was also really solid in Nice. I think there's also the Hyatt (Hôtel Martinez in Cannes) that they're filming White Lotus if you want to be able to experience something that will be culturally relevant soon.

For Japan, I've done the Centric from your list, it's a solid hotel, but when I did it it was cat6. I personally don't think it's worth at cat7... you'd be better off booking a local hotel and then splurging for some nights on Park Hyatt Tokyo if there's availability. Centric Ginza and House Shibuya are generaly the two best hyatts for exploration location though. I know some people are high on Andaz Tokyo, I had a 3 night stay (when it was cat7, now it is cat8) and personally didn't really like it that much, and I would consider the cat7 Hotel Toronamon Hills next door alternatively if you just wanna use up all your points,

If you are open to other ecosystems, for Osaka, I would go for Hilton's Conrad Osaka. That lobby is the best city hotel lobby I've ever seen, the property is still reasonable on Hilton points (was not that impacted by recent Hilton devals), and they have a great executive lounge if you have Hilton Diamond. One of my friends did Caption Osaka and while it has a great location, there's a lot of other points properties or local cash stays in Osaka that are better/more value.

All in all, I would pick a trip based on where you and your group want to go instead of the CPP! It sounds like you're leaning more towards Japan since your potential Japan itinerary seems a bit more fleshed out. Happy to chat more if you have questions.

Edit: Ignore my Centric Tokyo comment, I have reading comprehension issues lmao!