How can I make a block that activates nearby redstone-related blocks for a moment without conncecting to them directly?

like when it gets placed?

if you want to do that, simply make a second block, with a different texture (the second texture is optional), make B2 drop B1, and make B1 emmit redstone energy in "advanced propertys" but NOT B2, then make a procedure on B1 triggered with "on block added" and say this: Event trigger - triggered by external call     or when (global trigger): triggered by external call place [B2] at {x} {y} {z}