That was alot to sift through but I think this is your question.

My answer is yes, thats fine topping or fimming will just divert growth to the lower branches and restrict vertical growth.

If It were me I would just fim the top and not top it, you could save a few node sites at the top which will become another seperate branch each.

During the flowering stage those short braches that you see just developing at the top of the main shoot will stretch considerably and become short colas.