My Focus uses less gas coasting in N, than with engine braking, so I coast in N down hills or up to stops where I don't need any braking until the end. I'll rev match downshifts if I'm coming to a corner or down a very steep hill as it also feels dumb to burn up more brakes than I need to.
I dunno, just don't, slip the clutch a lot, rest your hand the stick or your foot on the clutch pedal, rush your shifts for no reason(you can feel the synchos do their job), rev match your downshifts, and your transmission and clutch should last the life of your car.
I spend some time on manual transmission buses from the communist era(owned by the drivers I believe) in the Polish country side 20 years ago and those guys were smooth and efficient and easy on the equipment. They had their driving to the routes optimized, and coasted down every hill that didn't need engine braking, almost never a complete stop that needed the clutch slipped, and probably some of those buses are still going! It wasn't fast but it was more like a ferry boat trip. It was a nice way to travel compared to Greyhound buses in Canada where the drivers use the brakes and gas like on/off switches and see if they can lift the inside front tire in the corners in the mountains...