Day and week rentals exist and they'll do what you're describing. The part worth thinking about first is what happens when the rental ends, because the account outlives the number. Any later re-verification goes to a number somebody else is holding by then.
We run into the same shape from the other side. In our own Telegram account supply the SIM cards are destroyed about a day after handover, so the number stops being available almost immediately. What makes that survivable is setting a recovery address you control on the account right away, while the number is still live. After that the number stops being the only key to the door.
So if these are genuinely disposable accounts you'll never touch again, a day rental is cheap and fine. If any of them might matter in three months, treat the number as a door you're about to lose and build a second one before it closes.
Best,
Floqal