...but add to random lockers, more rare than blueprints (like oil cans)...
They should not be easy botted.
I manage to find around 30 oil cans in month being developed. But still are "locker" items I didn't find.
You can get implants now from Old Military Base. It is hard to find and still can be make solo( two shitty builds using fastrelog, maybe someone with good build could do this without fast relog)
But my Master agree with you, there should be more ways to get implants for solo players, not easy of course.