Yes, definitely. You are still going to need a good amount of %bonus damage to pets and it will never be as good as converted damage, everything else being equal. But the potential to be more than decent of a build is definitely there, especially if you are also going for amulet + off-hand Total Damage modifiers for Briarthorns.
Yeah, the lack of blueprints definitely hurts Bysmiel’s Trinket farming even at high SR.
Highly likely since builds have been nerfed over less. As much as I love Pet builds, this thing here is an absolute monster. So, would actually be surprising if it didn’t get hit with a balance patch.
However, at the same time, there are quite a few different variables and the greens used play a non negligible part in it. I remember builds with double rare MIs and such getting more leeway in regards to nerfs, but not sure if that still applies.
I can however, safely say that even incase of nerfs, the build is still going to be rather strong simply due to how much damage it is packing.