I think they could have a bigger thing about the final week
Like if there were lots of housemates, they could still do single evictions but on the final week, they would evict one housemate each night building up to the final. It would all be a vote to win and the housemate with the fewest votes each night would get the boot, and it would culminate with a final 3 or 4 on the last night. So they could still have 7 or 8 in the final week. I think they should try that one time.
I just think it would make the final week more intense and like a final sprint to the finish line - not every year but one year maybe
