Cash sets don't restrict you to a certain blind structure, unless you restrict yourself to the idea that your big blind must be two of a given denomination.
You can play 1/2 and 2/4 and 3/6 with bright white checks - you don't need $2 checks and $3 checks. Even 4/8 are both four-check stacks - four bright white for the small, three bright white and a red for the big. You don't need a $4 check.
To me, those chips only really make sense in a card room where that table is going to be playing those exact stakes for sixty minutes an hour for 16 hours straight every day, and where you want to keep unnecessary stacks off the table.
Likewise playing 10/20 with $5 checks - you don't have to get $10 checks. You just need need enough chips in the ranges you want to play; you're not at all restricted within that range. And the ranges are pretty broad - I don't feel you ever need more than 200 chips of a given denom for a 10-person cash table. If you get 200 each of quarters through $25s, you're covering a wide, wide range of stakes without even pulling your hundos into play (and you only need to add nickels to cover micro stakes, too.)