Most junipers root fairly easily from cuttings, your scion is about the right size for a cutting.
Blaauw is an exception. I found them very difficult to root. Even as air layers, I've had one out of six air layers that produced roots in a two year timespan. One still left on the mother tree, but still without roots after 2 years.
I think it has something to do with their naturally low auxin levels. This makes them attractive because they puff up naturally without pruning.
But very difficult to propagate.. From the 50 or so cuttings, I haven't had a single one produce roots.
Literature states that they're the most difficult variety of junipers to propagate. The people describing techniques have 20% success rates as their maximum, though it's difficult to find more than 5 sources and most of them are pretty ancient (pre 2000's).
Since the cultivar has been developed in my country, I've been trying to find out who's propagating them and what their technique is. But it seems like it's a well kept trade secret.