I’m not entirely sure I understand the question. Radial symmetry automatically spaces the alphas evenly. Then I just eyeball a point on the center line and drag them out holding shift to snap to angles.
Heya DrkDve nice work 
Could you give a detailed explanation of your workflow as to what’s happening in video 1 and 2 after you draw the second plane.
How are you isolating the ornament shape so the original plane isn’t there? Are you just drawing the ornament pattern with it still on the first original plane, then pushing it back slightly in the z-depth with the Move Manipulator so it’s hidden by the second plane?
Sorry the vid was so fast I couldn’t tell what was going on. 
Most of what I’m doing is covered in depth in this Zclassroom Projection Master Techniques Video which I highly recommend. It goes into much cooler stuff too.
Basically you create the single detailed tool, then create a new plane, make it polymesh, divide a lot, then drop it into PM with deformation selected. Then instead of single layer brush or simple brush in the tool palette, choose the sculpted mesh you just did, and draw it on your new plane. If your sculpted mesh is based on a plane like mine, the background plane of the sculpted tool will basically begin at the same level as the new plane which you took into PM. I guess at that point they are basically 2 planes existing in the same 3d space, so only the higher details show up. If you had cut into the plane you would have to mess with the Z depth, but all I’m doing is in a Zadd direction, so all the detail shows up and the background plane, which represents 0 Z -axis data, is ignored when you leave PM mode.
Once you have drawn out an instance of your sculpted tool, you can switch to move/rotate/scale mode in order to position it. You can then press shift+s to leave a positioned instance in place and then move/scale/rotate an exact copy which starts with those changed properties. To do the long strips, choose the LineII stroke and mess with the Spacing slider to adjust the distance between instances in the stroke.
That’s basically it!
Talking about genuinely fertile imagination 
Awesome thread… I downloaded couple of your ornament renders for inspiration, hope you wont mind…great work!!
On the contrary, I’m glad you like them! I’m doing the same for yours.
Hurray for imaginations!