I think Kaine has a good idea here.
We had a discussion about this elsewhere: the idea of going in with a couple people and buying a few boxes and then splitting them between everyone. The problem is that I will be playing largely with family, though I can't wait to throw down with some of the local community (looking at you Cadilon). That means I'll be the only one buying them and, if my perfectionism wins out, the only one painting them and I'll want enough so that anyone playing can field whatever they want, within reason. I've never understood how someone can enjoy the whole random booster experience. I want to know what I'm buying and how many I need.
On the other hand, I thought it would be fun to have some randomness in things like Sidekicks. While you need to collect pawns in certain numbers to have enough to play, Sidekicks are on their own and you can use multiples of each (each player can take 1).
They would be the perfect models for random blisters.
"Here's a pack of three random Sidekicks." GW did something like this in the later days of Necromunda, where you could buy a fleet of regular fighters, and then a hero booster, which had a random leader and random heavy. Put them in clamshells and that would be perfect. Then you'd have:
-Starter Box
-Multiplayer Expansion Box
-Pawns 1,2,3
-Master Boosters (1 master puppet and 2 random Sidekicks)
Anyway...that's just my two cents....