Switching from Chase to Amex, advice on what to do with UR points ?

I have a Chase Sapphire Preferred, and I want to downgrade it to a Freedom Unlimited. I decided I want to focus my point accrual on AmEx MR (Plat + BBP) instead of splitting it between AmEx and Chase (but I still want to keep a no-AF Chase card for credit history and to have a Visa option for Costco or other just-in-case situations). Has anyone here gone through a similar switch and can lend some advice?

I have about 50k UR points. I think I have 3 options:

1. Transfer all my points to a partner speculatively even though I have no plans to go anywhere at the moment. I know Hyatt has the best value, but also JetBlue would probably be the most flexible/usable option because my airport is a hub and I find myself on JB often, and they're an AmEx transfer partner too (though not a very good CPP value).
2. Redeem the points as cashback after downgrading. Lower CPP value but the ultimate in flexibility.
3. Downgrade and don't touch the points, maybe on day I'll open a Sapphire again and I'll have those points ready and waiting, plus whatever I accrue in the meantime. But the way the CSP and CSR (especially post-refresh) are right now, I plan on sticking with AmEx.

Any other better options I have missed? What would you do? What partner would you transfer to if you choose option 1?