All of this just to avoid having to undo and redo the webbing on the left side? The webbing will have taken a set and can be easily marked if worried with either a silver Sharpie or a white grease pencil. Yes, the left side is the PITA side but this could have been done with and completed two days ago. Just do it, do it the right way. This is a 30 minute job.
If I am carrying my Tekna knife or shears, that goes on the left waist strap and the line cutter then goes on the left shoulder strap. If I am not carrying a knife or shears due to their being forbidden (as is increasingly the case) or just not needed then the line cutter can take that place. I guess, really, the Hog way, is for the cutting tool to be on the left side waist.
For plate and webbing work, I usually schedule that for Saturday evening while watching old, stupid Sci Fi flicks (actually, this past Saturday, I watched Run Down with the Rock while adjusting a BP/wing) and that after having consumed copious amounts of wine and a gummy or two. Usually this combination of a stupid movie, wine and THC is sufficiently mind numbing to dull the pain. Sometimes when I wake up I find things a little off but there is always next Saturday evening to once again get creative

. And

the following morning while surveying the results of the evening, priceless.
Pro tip. If you have old Sea Hunt episodes I find that those will put me to sleep before I am finished leaving me to finish the following morning. The monotone droning narrative is hypnotic, better than white noise.