I don't want to offend you just some of your comment's have been a bit to odd to me.
I have to agree that you are looking at taking to many cutting tools on your trip, personally if I were you starting from scratch with the knife buying I Would consider a muilty tool, stainless Mora for salt water fish prep (you can use this knife for more than just filleting whereas a filleting knife isn't much good at anything else), a carbon Mora for woodwork and general chores, light weight folding saw and you have an axe already. I know everyone goes on about moras but they are good and very light ( 3 moras probably weigh the same as a 4mm thick Bushcraft knife.
Sharpening is all practice ,cheap diamond stones from discount stores are ok but don't last like quality ones and they are a bit rough , personally the wet and dry DIY kits are great but you may need a few pre taped sections of wetndry as spares, when the fishing knife gets blunt just put a rough edge on it and th wood cutting knife keep it stropped as long as you don't do any silly cuts with it on materials that are to hard the edge should last a long time ( Mora carving knives are small and light may be worth taking one of them for whittling in the evenings ). Don't carry a concealed knife for protection , use a walking staff, lots of uses including a club for self defence.
Hope this helps a bit. Any thing I can help with just ask, I wish I could get out for 80 days! Can't wait for my 8 days in Sweden.