I am in concurrence with XTSHO and Observe & Report.
Also, from experience, the DJ Short Blueberry genes carry a lot of hermaphroditic alleles.
I would also suggest avoiding STS as the progeny will inherit the forced genetic mutation.
What I would do is:
1. Clone the Pebble cut en masse.
2. Flower all the males and collect their pollen (label them)
3. Pollinate branches marking each (surveying tape works well)
4. Germinate and flower a large pop. (100 seeds) can be done in a very small space and on a budget
5. Cull the weak
6. Week 4-5 flower you will know whos got their terpenes going
7. Collect seeds of preferred expression.
What you seek to do is challenging!
Best of luck.
Happy growing!