No, Tierheims will not let you take just one rabbit. Generally, they will have already paired up lone rabbits with another one anyway. So you will have to choose the right pair for you.
I disagree that breeders rabbits are more friendly and used to being handled. I'm sure rabbit breeders don't have time to play and cuddle the rabbits all day. There used to be a breeder in my road and the rabbits were kept in lots of small cages in a shed in the garden and didn't get to see much day light, let alone cuddles. Obviously i am not speaking for every breeder here.
Get 2 from a Tierheim, you will make 2 bunnies very happy, i did!