NO SUPPORT
In my opinion adding skills sets to fishing bottles + nests would make them way too passive to obtain.
As of Farming setup from the farming contract boxes, it takes a certain amount of effort and luck in order to obtain them. Same goes for the Pyromancer set from Wintertodt (Firemaking set)
I do however support the note about Angler set is abit rubbish only obtainable from the Aeriel Fishing activity, this could however be solved by adding it to the Tempoross droptable aswell.
For the matter of the Lumberjack set, there's already an alternative. In the Woodcutting Guild you can trade in 6k Redwood logs for the set at the Guildmaster.